upgrade foreman to rails 3.2.13

This commit updates from rails 3.0.x to 3.2.x, main changes include:

• Asset pipline support
• cleanup of existing assets (javascript, css, images)

Users who uses foreman in production, make sure that you now compile
your assets, e.g...

fixes #2275 - include ThreadSession::Cleaner only once

Foreman::ThreadSession::Cleaner was included in Taxonomy concern,
which postponed the session clearing (that should be the first thing
to happen in filters) to phase after :authorize filter, effectively...

fixes #2239 API v2 CRUD for locations and organizations and added nested loc/org