Refine posts implementation.
Refactor tests to use Fabricate
Refactor login in tests into a helper.
Require users to be authenticated to squmbl.
Begin the adventure! Second PR list
Added mailer for user registration and letter_opener gem for testing.
added email_spec to Gemfile, prepared tests to use email_spec
Added tests using email_spec
Disabled letter_opener and removed the hardcoded URL from user_mailer
Merge branch 'mail' of https://github.com/maxwellv/squmblr into mail

Conflicts:
	Gemfile.lock
	app/mailers/user_mailer.rb
	spec/mailers/user_mailer_spec.rb