ZF-3099: Add helper methods and classes for YouTube API functionality

Description

Add helper methods and classes for YouTube API functionality

Comments

Adding helper methods and tests to make setting and getting the yt:recorded element easier in revision 11761.

We have support for all v1 and v2 functionality as of ZF 1.7.2 so I am resolving this issue. A few minor details are missing such as extension elements for yt:statistics that were recently added. Separate issues have already been created for those.