couple of minor fix and improvement

1. the property name is not matched in the admin confirmation mail template
2. enable application 'allow_open_registration', 'registration_requires_email_confirmation', 'registration_requires_admin_approval', 'notify_admin_of_new_users' property
3. correct spring configuration, clockResolution as a static filed, can't be injected directly
4. remove duplicated stack/core/src/main/resources/usergrid-scheduler-context.xml
5. allow custom properties when creating new app, that was ignored.
6. checking if the UserInfo has a valid email predefined when sending email to the user
7. more token checking in case