Bump rspec.
Add shared_context 'rack-test'.
Spec for base case of POST /api/v1/posts/create .
Refactor api/post_spec.rb .
Failing spec: it 'removes markup from the source'
Strip markup from the submitted "source" for /api/v1/posts/create .
One-time migration script to strip Markdown and HTML from posts.via field.
Remove Libertre.plain call from SPV and excerpt views.

plain is being called at reception time in the API.  Note also that
there is a migration script that should be run to clean up existing
DB records.  2013-03-22-0025-plainize-posts-via.rb
Merge branch 'plainize-api-post'