Updated to dev-develop

- Ready for 2.2.0; will change to 2.2.0rc1 when released.
Created blog post for 2.2.0RC1 announcement
Updated zf2 version to 2.2.0.
Added information on issues archival.
Compiled blog
Updated home page
Minor update to blog post

- detailed RC period tasks
Merge branch 'feature/2.2.0' into develop

Ready for 2.2.0rc1