Refactor: Extract getHCache and addHCache.
Persist the token in Redis asynchronously.
Change test setup.
Decrease # of MaxActive and MaxIdle connections with Redis.
Validate if current user is still valid before using it (it must exists in the database).
Added a save-deps task
Add Makefile, and GoDeps tasks

Signed-off-by: Wilson Júnior <wilsonpjunior@gmail.com>
Merge branch 'master' of https://github.com/wpjunior/backstage into wilson
Return a "Bad Request" response when trying to delete a non-existing user.
Add header  in each API response.