PDO: made various properties static if to do with table definitions
new Model stuff on the PSR2 side
PSR2 code fixes
Model class now has savePostprocess() hook and castDbData() to ensure ints are ints
createFragmentFromArray now ignores attributes with null values
ArtfulRobot/PDO buildCollection offers better filtering; Collection has a find method
Collection object now implements countable
PSR2 camelCaseCorrection