* Rails actions are now Rack endpoints, and can be retrieved
    via FooController.action(name) and called with an env
  * Updated some tests that relied on the old internal
    #process/#call implementation

Ported over the concept of public instance methods on controller child classes as callable action methods

Trying to avoid premature proliferation of modules.

[#2595 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#2594 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#2346 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Ensure ActiveRecord::Base.connection_pool.with_connection creates a new connection only when needed [#1752 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

Methods raising ActiveRecord::RecordNotFound were returning 404 on first request and 200 OK with blank body on subsequent requests.

[#2533 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>