install gems
Revert "install gems"

This reverts commit 89b5863e0a8a1bd9a0fde1ee90c40040f2be76d5.
added user migration and readme
user - roles join table
migrate
RoleCategory model
remove some model
post and comments
empty readme
rake doc:app
Associations
Merge pull request #1 from adonespitogo/feature/migrations

Feature/migrations