remove quoting from FILES env variable

Author: mmcky

Makefile

@@ -47,33 +47,33 @@ clean-pdf:
 
 coverage:
 ifneq ($(strip $(parallel)),)
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDCOVERAGE)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_make_coverage=1 -D jupyter_execute_notebooks=1 -D jupyter_ignore_skip_test=0 -D jupyter_template_coverage_file_path="error_report_template.html" -D jupyter_number_workers=$(parallel) 
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDCOVERAGE)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_make_coverage=1 -D jupyter_execute_notebooks=1 -D jupyter_ignore_skip_test=0 -D jupyter_template_coverage_file_path="error_report_template.html" -D jupyter_number_workers=$(parallel) 
 else
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDCOVERAGE)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_make_coverage=1 -D jupyter_execute_notebooks=1 -D jupyter_ignore_skip_test=0 -D jupyter_template_coverage_file_path="error_report_template.html"
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDCOVERAGE)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_make_coverage=1 -D jupyter_execute_notebooks=1 -D jupyter_ignore_skip_test=0 -D jupyter_template_coverage_file_path="error_report_template.html"
 endif
 
 website:
 ifneq ($(strip $(parallel)),)
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDWEBSITE)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_make_site=1 -D jupyter_generate_html=1 -D jupyter_download_nb=1 -D jupyter_execute_notebooks=1 -D jupyter_target_html=1 -D jupyter_download_nb_image_urlpath="https://s3-ap-southeast-2.amazonaws.com/python-programming.quantecon.org/_static/" -D jupyter_images_markdown=0 -D jupyter_html_template="html.tpl" -D jupyter_download_nb_urlpath="https://python-programming.quantecon.org/" -D jupyter_coverage_dir=$(BUILDCOVERAGE) -D jupyter_number_workers=$(parallel)
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDWEBSITE)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_make_site=1 -D jupyter_generate_html=1 -D jupyter_download_nb=1 -D jupyter_execute_notebooks=1 -D jupyter_target_html=1 -D jupyter_download_nb_image_urlpath="https://s3-ap-southeast-2.amazonaws.com/python-programming.quantecon.org/_static/" -D jupyter_images_markdown=0 -D jupyter_html_template="html.tpl" -D jupyter_download_nb_urlpath="https://python-programming.quantecon.org/" -D jupyter_coverage_dir=$(BUILDCOVERAGE) -D jupyter_number_workers=$(parallel)
 
 else
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDWEBSITE)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_make_site=1 -D jupyter_generate_html=1 -D jupyter_download_nb=1 -D jupyter_execute_notebooks=1 -D jupyter_target_html=1 -D jupyter_download_nb_image_urlpath="https://s3-ap-southeast-2.amazonaws.com/python-programming.quantecon.org/_static/" -D jupyter_images_markdown=0 -D jupyter_html_template="html.tpl" -D jupyter_download_nb_urlpath="https://python-programming.quantecon.org/" -D jupyter_coverage_dir=$(BUILDCOVERAGE)
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDWEBSITE)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_make_site=1 -D jupyter_generate_html=1 -D jupyter_download_nb=1 -D jupyter_execute_notebooks=1 -D jupyter_target_html=1 -D jupyter_download_nb_image_urlpath="https://s3-ap-southeast-2.amazonaws.com/python-programming.quantecon.org/_static/" -D jupyter_images_markdown=0 -D jupyter_html_template="html.tpl" -D jupyter_download_nb_urlpath="https://python-programming.quantecon.org/" -D jupyter_coverage_dir=$(BUILDCOVERAGE)
 endif
 
 pdf:
 ifneq ($(strip $(parallel)),)
-	@$(SPHINXBUILD) -M jupyterpdf "$(SOURCEDIR)" "$(BUILDDIR)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_latex_template="latex.tpl" -D jupyter_latex_template_book="latex_book.tpl" -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_pdf_book=1 -D jupyter_target_pdf=1 -D jupyter_number_workers=$(parallel)
+	@$(SPHINXBUILD) -M jupyterpdf "$(SOURCEDIR)" "$(BUILDDIR)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_latex_template="latex.tpl" -D jupyter_latex_template_book="latex_book.tpl" -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_pdf_book=1 -D jupyter_target_pdf=1 -D jupyter_number_workers=$(parallel)
 
 else
-	@$(SPHINXBUILD) -M jupyterpdf "$(SOURCEDIR)" "$(BUILDDIR)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_latex_template="latex.tpl" -D jupyter_latex_template_book="latex_book.tpl" -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_pdf_book=1 -D jupyter_target_pdf=1
+	@$(SPHINXBUILD) -M jupyterpdf "$(SOURCEDIR)" "$(BUILDDIR)" "$(FILES) $(SPHINXOPTS) $(O) -D jupyter_latex_template="latex.tpl" -D jupyter_latex_template_book="latex_book.tpl" -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_pdf_book=1 -D jupyter_target_pdf=1
 endif
 
 constructor-pdf:
 ifneq ($(strip $(parallel)),)
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDPDF)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_number_workers=$(parallel)
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDPDF)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1 -D jupyter_number_workers=$(parallel)
 
 else
-	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDPDF)" "$(FILES)" $(SPHINXOPTS) $(O) -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1
+	@$(SPHINXBUILD) -M jupyter "$(SOURCEDIR)" "$(BUILDPDF)" $(FILES) $(SPHINXOPTS) $(O) -D jupyter_images_markdown=1 -D jupyter_execute_notebooks=1
 endif
 
 notebooks: