Move alerts, add '.disappear' class for fade outs

[#chore]
Configure mailer in development and production

* using mailcatcher for development mail

[#14]
Add InvitationMailer

[#14]
Clean up some translations and organize routes

[#chore]
Add invitation request routes and translations

[#14]
Add InvitationRequest model

[#14]
Implement InvitationRequestsController and views

[#14]
Add welcome message and link to request invitation when logged out

[#14]
Add pending invitation request count to team views

[#14]