Adding a git wrapper script + docs per #8

which is named `rubymine-git-wrapper`, although it should work fine with
*anything* that's depending on the git command line interface for
committing.

I also touched up some RuboCop bits and markdown code block gating
:scream_cat:
Merge remote-tracking branch 'origin/master' into rubymine-git-wrapper

Conflicts:
	README.md
Fixing Markdown for commit instructions
Merge remote-tracking branch 'origin/fixing-rubocop-complaints' into rubymine-git-wrapper

Conflicts:
	git-duet.gemspec
Merge branch 'fixing-rubocop-complaints' into rubymine-git-wrapper
Testing set of alpha as author
Merge remote-tracking branch 'origin/master' into rubymine-git-wrapper
Merge remote-tracking branch 'origin/master' into rubymine-git-wrapper

Conflicts:
	README.md
Correcting RuboCop const
Correcting rubocop offense
Merge pull request #12 from modcloth/rubymine-git-wrapper

Adding a git wrapper script + docs per #8