package.json cleanup - minor
Plural patterns: use single quotes
Update version in package.json
Remove the jshint exclusion for plural rules, they follow the standard now
Fix the country code case issue

If the locale is en-US, jquery.i18n was wrongly looking for messages
mapped to en-us and returning without resolving.

Fixed this and added tests

Fixes issue #50
Add grunt-cli as dependency
Merge pull request #51 from santhoshtr/master

Fix the country code case issue