Merge branch 'free_memory'

Author: jgfoster

exe/arduino_ci.rb

@@ -506,7 +506,7 @@ def perform_example_compilation_tests(cpp_library, config)
           output = @backend.last_msg
           puts output
           i = output.index("leaving")
-          free_space = output[i + 8..-1].to_i()
+          free_space = output[i + 8..-1].to_i
           min_free_space = @cli_options[:min_free_space]
           if free_space < min_free_space
             puts "Free space of #{free_space} is less than minimum of #{min_free_space}"