AccountPage.feature bdd test
hidden text on account page
Made Account page feature
made abstract class for our form factories
Exception/ExceptionInterface.php
error.twig and format for handling exceptions
made all of the exception class implement ExceptionInterface
Merge branch 'integration' of https://github.com/agilemusicproject/agilemusicproject.com into integration

Conflicts:
	src/AMP/Form/UpdateAccountFormFactory.php
	web/css/style.css
Merge branch 'local_chris' into integration

Conflicts:
	web/index.php
AccountPage.feature passes with new changes to accountPage form