Revert "Downgrade devise to 3.3.0 in respect of devise-token_authenticatable"

This reverts commit 3dfc068403a2ef7eefd6800c924338944d4e4477.

Conflicts:

	Gemfile.lock
bump devise-token_authenticatable to v0.3.0
Simplify toggle_chat_privilege
Removed column in the initial migration file
Enabled user controller spec for testing token authentication