[#5] Omniauth, omniauth-facebook and dotenv gems installed.
[#5] Users can login through Facebook.
Merge branch 'feature/4_post_page' into feature/5_users_login

Conflicts:
	config/routes.rb
	db/schema.rb
[#5] Dotenv added.
[#5] Letter opener added
Merge branch 'feature/4_post_page' into feature/5_users_login
Merge branch 'feature/4_post_page' into feature/5_users_login

Conflicts:
	db/schema.rb
Merge branch 'feature/4_post_page' into feature/5_users_login
[#5] Auth now uses devise omniauthable
[#5] Cleanup
Merge branch 'feature/4_post_page' into feature/5_users_login
Merge branch 'feature/4_post_page' into feature/5_users_login
[#5] PR comments solved
Merge branch 'feature/4_post_page' into feature/5_users_login

Conflicts:
	app/models/user.rb
[#5] Get facebook image when signing up from fb
Merge branch 'feature/4_post_page' into feature/5_users_login
[#5] PR comment solved
Merge branch 'feature/4_post_page' into feature/5_users_login
Merge branch 'feature/4_post_page' into feature/5_users_login
Merge branch 'master' into feature/5_users_login