Add configuration instructions for Contacts on OS X
Add configuration instructions for Contacts on iOS
Replace radicale with Radicale when talking about the service
Merge branch 'add_apple_contacts_documentation' of git://github.com/cimm/Radicale into cimm-add_apple_contacts_documentation

Conflicts:
	pages/user_documentation.rst
Merge branch 'cimm-add_apple_contacts_documentation' into website