Breaks REST for node entities

[nickschuch]

Im still looking into this issue, so far I have been testing in an install profile. Steps:

• Install profile with no default_content.
• Installing with and without default_content module
• Running a curl request at the site to create a new node

Results in:

[Guzzle\Http\Exception\ClientErrorResponseException]
Client error response
[status code] 400
[reason phrase] Bad Request
[url] http://site.dev/entity/node

Im still looking into this, but thought I should document my current efforts.