Merge pull request #160 from voltan/master

Update pi theme
Doc updates
Doc updates
Restored missing files
Dropped abstract static class functions
Update README-GIT.md
Update README-GIT.md
Upgraded Zend Framework to 2.2.2 as Issue #151
Merge branch 'master' into zf
Prepre docs for Pi 2.2.2 release
Prepre docs for Pi 2.2.2 release
Prepre docs for Pi 2.2.2 release
Prepre docs for Pi 2.2.2 release