Allow Apache service not to be managed by Puppet

Currently Apache can either configured to be 'running' or 'stopped'. In our cluster setup Apache is managed by Pacemaker, so Puppet should not interfere. Setting ensure to 'UNSET' will now set ensure to undef for the Apache service.
The apache class now accepts true, false, 'running' or 'stopped' for the parameter service_ensure. Any other value wil result in the parameter 'ensure' for the Apache service being set to undef.
Whoops
Added WSGIPassAuthorization option to vhost.
Added The ProxyPreserveHost option to vhosts.
Updated readme with WSGIPassAuthorization information, updated spec and
rspec tests for WSGIPassAuthorization.
added documentation and test for ProxyPreserveHost option
 Configure Passenger in separate .conf file on Debian so PassengerRoot isn't lost

The changes in 005bf615c are also necessary for Ubuntu 14.04 which now
ships Passenger 4.x
Merge pull request #711 from GregSutcliffe/master

 Configure Passenger in separate .conf file on Debian so PassengerRoot isn't lost
Add a nodeset for Ubuntu 14.04.
Merge pull request #719 from mhaskel/ubuntu-testing

Add a nodeset for Ubuntu 14.04.
'be_mode' was getting confused by the leading 0.
Merge pull request #720 from mhaskel/vhost_mode_fix

'be_mode' was getting confused by the leading 0.
Some initial cleanup for RHEL7.

There are still some test issues, although mostly related to the lack of 'normal' EPEL and passenger packages.  Also, still need to fix SELinux for non-standard paths, but that's going to be a big change.
Merge pull request #723 from mhaskel/rhel7-fixes

Some initial cleanup for RHEL7.
Add fastcgi external server defined type
SELinux updates.

Updates to the tests to make them work when SELinux is in enforcing mode. Also update the documentation with information on what needs to be done if you're using custom paths with SELinux.
Fix issues in the travis-ci build.
Merge pull request #725 from mhaskel/travis

Fix issues in the travis-ci build.
Merge pull request #724 from mhaskel/selinux

SELinux updates.