Remove primary contact for client

[controller]
- remove set_default_contact() from client controller
- change ajaxGetContacts() to retrieve all contacts from db

[migration]
- remove contact_id column from create client table schema.
- edit the seeds from client table seeder

[model]
- remove the one to many relationship from both Client and Contact models

[route]
- remove parameter from ajaxGetContacts route

[view]
- remove the set primary contact button from client edit view