Added DB Migrations & Read/Write Permissions

Use ambelic to do database migrations (db_init will make it current,
ambelic updgrade head will take it from the current revision, up to the
latest, useful for production where db_init will not change the schema
of existing tables).
resolved merge conflict

Merge branch 'master' of github.com:ephur/crud_config into extend_auth

Conflicts:
	.gitignore
	tools/init_db.py