Add is_partner to the CodeSchool table

[nagano564]

Description of changes

Add is_partner to the CodeSchool table. Defaulting to false and null false Add attr to serializer Add attr to strong params Update apiary docs Add spec illustrating presence Add attr to factory, default to false Creates a new rake task to set any existing, relevant CodeSchool records in prod to is_partner: true

Issue Resolved

Fixes #275

[hpjaj]

@nagano564 - Here is a current list of the code schools in prod:

https://gist.github.com/hpjaj/517f132bed58f3226b4728744578a823

[nagano564]

Here is a gist of the current school that is_partner

https://gist.github.com/nagano564/b0af55dae73e6e4249d29698430c2c0f