fixes #832 - adds parameterized class support

Credits:
This patch is based on the original work of Olivier Favre
<olivier@yakaz.com> many many thanks!

• import class parameters, and try to understand their types
• support a complex matrix of environments, puppet classes and their...

fixes #1820 - Authenticate API calls via REMOTE_USER

This patch allows API requests authentication via REMOTE_USER
only if authorize_login_delegation and authorize_login_delegation_api
are enabled.

api v1 - OAuth user mapping

fixes #1799 moved REMOTE_ADDR verification to settings

fixes #1576 - api v1 - oauth support

• to use set and enable oauth in settings
• correcting typo

fixes #1544 - Updating a host fails if you cannot reach the SOA nameservers

fixes #137 - Better support for non-hostname certnames

This patch introduce a new setting :use_uuid_for_certificates which
defaults to false.

users who wish to deploy their hosts using a random unique id, should
enable that setting, and use the certname directive in their puppet.conf...

ensure rubygems are loaded in case facter / puppet are installed as a gem

cleanups to rails 3 boot process

code smell