fixes #2390 - Add :host_id to BMC options hash

   Also make power actions return a simple true/false instead of JSON
   and add a helper to generate the bmc urls
[refactor] breakdown of proxy api classes

the proxy api had many classes in a single file, this commit simply break it down
Enforce hostgroup/role uniqueness on User relation
fixes #2398 - fix ruby 1.9 issue when loading free ip, causing {} in URL
Bumped the Rails version to match what's in the nightly tag
Added RHEL6 and F18 comps
Added f18 releases to tito and fixed some typos
Use https when accessing Rubygems.org
fixes #2405 - disable DNS orchestration during TFTP tests, causing timeouts
refs #2254 - STI Host relationships
fixes #2263 search Hostgroup by label
fixes #2247 Provides an option to disable the use of gravatara

A new setting is added, use_gravatar. It defaults to true. If it is set to false, then the gravatar
call out is not used and only the default user icon is used.
fixes #2360 loading parameters on host edit form when hostgroup or environment is changed
fixes #2417 - SSO abstractioning

Apache and Signo SSO reworked to a new general SSO concept.

You can use SSO service that comes with Katello for loggin in. It's
based on OpenID protocol with slightly customized provider.
Merge remote-tracking branch 'foreman/develop' by rel-eng/build.sh

Conflicts:
	app/models/hostgroup.rb
	foreman.spec
	lib/proxy_api.rb
Automatic rebase to latest nightly Foreman
Automatic commit of package [foreman] minor release [1.1stable-26.4e7ea9b].