Fix JSHint on open renamed files
Add support for .jshintrc files

If a .js file has a .jshintrc in any parent directory, that file will be
used instead of the configuration in Web Essentials settings.

If the .jshintrc is not valid Javascript, this will break.

Fixes #11
Fix 'invalid option globals'
Merge pull request #13 from SLaks/jshint-fixes

JSHint Improvements