(packaging) Use the packaging loader for tasks

The packaging repo now uses an explicit loader which handles loading the
various rake tasks in packaging. This commit updates the facter Rakefile to use
the loader instead of a blind glob of the ext/packaging/tasks directory. We
move this load into the rescue LoadError block because the packaging repo won't
always be there, and require 'rake' ahead of time.
(packaging) Remove Ubuntu Oneiric from build targets

Oneiric is EOL, and we are no longer building for it. This commit removes the
Oneiric target from the build list for facter.

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge pull request #460 from MosesMendoza/maint/stable/packaging_loader

(packaging) Use the packaging loader for tasks
Merge branch 'stable'

* stable:
  (packaging) Use the packaging loader for tasks
Merge pull request #461 from MosesMendoza/maint/stable/remove_oneiric

(packaging) Remove Ubuntu Oneiric from build targets
Merge branch 'stable'

* stable:
  (packaging) Remove Ubuntu Oneiric from build targets
(packaging) Update FACTERVERSION to 1.7.2-rc1
Merge branch 'stable'
(maint) remove stale documentation directory

The documentation directory has long been superceded by the puppet-docs
repo (https://github.com/puppetlabs/puppet-docs) and other sources. This
commit removes the directory to reduce clutter.
Add physicalprocessorcount fact for OpenBSD
Merge branch 'pull-462'
Merge pull request #464 from adrienthebo/maint-remove_documentation_directory

(maint) remove stale documentation directory
(maint) Remove unused facter.conf

Facter.conf is not used anywhere in facter and has not been modified in the
entire git history of facter. This commit removes the file and directory to
reduce clutter.
Merge pull request #466 from haus/remove_facter_conf

(maint) Remove unused facter.conf