Fixed #267 Email verification feature (#268)

* <Implemented basic welcome email upon signup>

* <Added config option to enable>

* <Added verification link routing>

* <Added views for verify/resend and reconfigured routes>

* <Finished Verification System minus Rspec changes>

* <Fixed code style>

* <Modified dome rspec tests>

* <Switched sample env back to default>

* <Added test cases to increase code coverage>

* <Added test_helper>

* <Minor code changes>

* <Added requested changes>

* <Added requested changes>

* <see if this fixes migration>

* <see if this fixes migration>

* <fixed migrations>

* Delete .rake_tasks~

* Update _confirm_button.html.erb

* Update _resend_button.html.erb

* Update verify_email.html.erb

* Update verify_email.text.erb

* <Fixed bugs>

* <Added validation of verification link and fixed some code style>

* <Disabled updating email for omniauth>

config/application.rb

@@ -68,6 +68,9 @@ module Greenlight
       config.bigbluebutton_endpoint += "api/" unless config.bigbluebutton_endpoint.ends_with?('api/')
     end
 
+    # Determine if GreenLight should enable email verification
+    config.enable_email_verification = (ENV['GREENLIGHT_MAIL_NOTIFICATIONS'] == "true")
+
     # Determine if GreenLight should allow non-omniauth signup/login.
     config.allow_user_signup = (ENV['ALLOW_GREENLIGHT_ACCOUNTS'] == "true")