Merge branch 'feature/update_gitignore' into 'master'

feature/update_gitignore: Updating .gitignore for some common filetypes.

See merge request sdk/ESP8266_RTOS_SDK!795

Author: donghengqaz

.gitignore

@@ -1,4 +1,5 @@
 *.o
+*.pyc
 
 # eclipse setting
 .settings
@@ -17,3 +18,17 @@ examples/**/build
 tools/unit-test-app/sdkconfig
 tools/unit-test-app/sdkconfig.old
 tools/unit-test-app/build
+
+# emacs
+.dir-locals.el
+
+# emacs temp file suffixes
+*~
+.#*
+\#*#
+
+# eclipse setting
+.settings
+
+# MacOS directory files
+.DS_Store