refactor PympaSocialAccountAdapter, method pre_social_login is working in progress
changes in PympaUser model:
- add copy_field method for coping an list of fields from user to other user
 - modify get_absolute_url
add email_new_sociallogin to PympaUserManager for send mail on creation of sociallogin and relative local user
re-add custom url
add template for email for new social account
add tests for custom manager and google login procedure