exclude README* editor backup file on yardoc execution

backup file is like README~ or README.md~.
This file should not be chosen when generating docs by yard.

References #777
Fix inverted conditional in Logger#show_progress

Prior to this patch, YARD would show animated progress even when `--debug` was
specified. The progress animation renders any debugger REPL unusable, so having
a way to disable it from the command line is critical.
Turned on the lax spacing option of Redcarpet to comply with the Markdown standard
Support for named arguments of Ruby >= 2.1
Remove @path from old commit

References df5c88dc983ace4a27baceda6150f9837a92e0f4
Try a force reload (window.reload) for Firefox
Merge pull request #790 from fuminori-ido/exclude_README_prototype

exclude README* editor backup file on yardoc execution
Merge pull request #785 from IvanUkhov/named-arguments

Support for named arguments of Ruby >= 2.1
Merge pull request #783 from Sharpie/fix-debug-progress

Fix inverted conditional in Logger#show_progress