Create bower.json
Changed wording of failed test messages
Added support for 2-digit time zone designators

Fixes #156
Bumped version to 1.3.1
Added Vietnamese (vi) locale
Added contribution guidelines
Merge branch 'master' into oscarotero-master

* master:
  Added contribution guidelines
  Added Vietnamese (vi) locale
  Bumped version to 1.3.1
  Added support for 2-digit time zone designators
  Changed wording of failed test messages
Updated versions in bower.json