twitter/bower — pull request #194 by brandondrew (2012-12-30 02:04:53+00:00)
Title: grammar fix to README

It could be 'an URL' or 'a URL' (depending on whether 'URL' is pronounced as an acronym, or its initials are spoken), but 'and URL' is definitely a mistake. Since it is most likely just a typo, I'll assume 'an URL' was intended.