Adding initial tile models
First UI tests
Further grid layout changes
Almost finished tile classes
Adding rachel files
Need to build string I/O
Merge branch 'ShirleyB' of https://github.com/tjzfx/CSF_Scrabble into rachel
Figured out single char grid placement, background test, and called first TextView for access
Merge branch 'tjz' into ShirleyB
Working on move class
merge please
Merge branch 'master' of https://github.com/tjzfx/CSF_Scrabble into rachel