Ignore Gemfile.lock
Remove unsupported options from default config

Fixes https://github.com/josephholsten/jshint.rb/issues/4
Fix NoMethodError when jshint.js array has nil elm

Sometimes the array from `jshint.js` will contain `nil` elements.
For example, when there are "too many errors", `jshint.js` will
return an array whose last element is `nil`. The array returned by
`run_lint` omits any such `nil` elements.
Merge pull request #8 from jaredbeck/compact_the_error_array

Fix NoMethodError when jshint.js array has nil elm
Merge pull request #6 from jaredbeck/ignore_gemfile_lock

Ignore Gemfile.lock
Merge pull request #7 from jaredbeck/remove_unsupported_config

Remove unsupported options from default config