Merge branch 'feature/new-post-zend-db' into develop

Ralph's Zend\Db post for 2.1.0
Merge branch 'hotfix/76' into develop

Forward port #76
Merge branch 'hotfix/72' into develop

Forward port #72
Merge branch 'hotfix/73' into develop

Forward port #73
Merge branch 'hotfix/74' into develop

Forward port #74
Merge branch 'releases/2.1.1' into develop

Ready for 2.1.1 release
Update apidoc version for 2.1
Merge branch 'hotfix/learn'

Fix apidoc link