"All Things Must Pass" including guardians and lea's

@plusjeff This PR cleans up the database by removing LEAs and Guardians. The ContactPerson model now has all the former guardian fields. 

I also added the phone numbers table and created a has_and_belongs_to_many relationship between contact people and phone numbers and also between students and contact_people. The second one is probably overkill since parents can't sign in and prepopulate the fields if they have more than one kid, but this leaves room for them to be able to do so in the future.

I'm still getting stuck at the 2nd screen of the guardian/first contact person step because of controller issues. Let me know if you can take a look tonight.

Thanks!