fixes #2229 add an IAM role field to a compute image.

This allows use of IAM to control access to AWS services within an instance.

fixes #2203 - add locations/organizations to subnet edit page

fixes 2228 json parsing failed

Feature: #686 - Hosts can inherit environment from hostgroup

Fixes #2199: Fix install media submit/cancel buttons when locations/orgs disabled - When locations and Organizations are disabled, the submit/cancel Buttons are not well displayed when you want to add a new medium.

Revert "ptables - displaying os_family and layout in api show and list"

This reverts commit ed315bd9449dc7fa11cf0a32ef195c1795197cc3.

ptables - displaying os_family and layout in api show and list

Using Apipie versioning features and Maruku for markdown

Apipie switched from Redcarpet to Maruku to avoid crashes of the C
Extension. No further need of compiling anything to get markdown support.

fixes #2154 - "Foreman" link in main navigation should link to dashboard

fixes #2159 - Provisioning information shown in locations/organizations while provisioning is disabled.