Added group of items functionality

Added circle.js group functionality. Allows the whole group of circle
sot have borders switched on and off and the intent is that this will
facilitate in defining the self-referential cellular automata item
address.
Playing with groups and filters
Return circles based on row and column address
Merge branch 'master' into _Cellular-Automata-Test-1
Merge pull request #1 from mmicuta/_Cellular-Automata-Test-1

 cellular automata test 1