module Filter - exception class
created module Api/Filter to handle any incomming filter data
added null values (as type and as string) support
renamed NOT IS operator type to IS NOT
added buildRestFilter &  buildRestFilterOperator
removed dateformatter dependency
updated interface
Merge branch 'api-filters' of git://github.com/oliwierptak/Everon into api-filters
style & cleanups
filter cleanups
created helper function for arrays; key value replacement
integrated filter value assignement
added aditional key for column bind and an integral bind
added parameter column_glue
implemented unique key value assignments
updated interface
Merge branch 'api-filters' into development
Merge branch 'development' of github.com-everon:oliwierptak/Everon into development