Add sign in and sign up core functinality

Core pieces are in place but not functional.
sign in and sign up complete

Sign in, sign up, sign out and header navigation for these items
are complete.
Merge branch 'master' of github.com:gsperka/tic_tac_toe into model
Merge pull request #2 from gsperka/model

Added Sign in, Sign up functionality
Merge branch 'master' into pseudobranch

Merging like a zip into Kevin.