Consider emails ending in matrix.org as a uni email

For the purposes of testing (and having a team page)

src/components/views/login/RegistrationForm.js

@@ -146,7 +146,7 @@ module.exports = React.createClass({
     },
 
     _isUniEmail: function(email) {
-        return email.endsWith('.ac.uk') || email.endsWith('.edu');
+        return email.endsWith('.ac.uk') || email.endsWith('.edu') || email.endsWith('matrix.org');
     },
 
     validateField: function(field_id) {