Updated ZF version to 2.1.*
Merge branch 'hotfix/update-zf'

Updated ZF to 2.1
Created outline for post 3 or REST series
Began post
Completed first draft of part 3
Final proofreading
Add "part 3" link to parts 1 and 2
Use HTML entities for < and >
Compiled blog
Merge branch 'posts/rest-part-3'

Restful APIs, part 3