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 #2250 API v2 add/remove puppetclasses from hosts and hostgroups

fixes #2319 make HostClass and HostgroupClass unique puppetclass_id by scope

fixes #2324 Refactoring of Host STI

Allows plugins to render a different STI-type edit form and save
the changed type. Also allows the /fact_values upload to specify
a type. Adds tests for the STI type changes.

fixes #2299 - Parameters Controller (API v2) can reset parameters (delete them all)

fixes #2272 setup capybara and spork and modified test_helper for future integration testing

fixes #2278 orchestration test failure

fixes #2219 - Hostgroup ownership is hierarchical

fixes #2274 renamed test/unit/orchestration.rb to test/unit/orchestration_test.rb

fixes #2268 - exec puppet in Bundler-less env, don't touch PATH when puppetgem is set