Include a pvremove module and pvabsent state

This is usefull for ensuring that the block device is removed from all
kernel memory.  This is required for detaching vdb's in xen.
Fix the logic ordering of pv_absent
check device names for physical volumes
fix git.py state pylint problems
Reflect the latest released version

This is a recurring problem in the release process. The same issue was pointed out for 2014.1.3 and is again a problem for 2014.1.4. Perhaps not the most severe issue here but I think it points to a bigger problem with the release management/process.

See https://github.com/saltstack/salt/issues/12032#issuecomment-41038471 for my comment and a discussion regarding the issue as a whole.
Merge pull request #12690 from gtmanfred/develop

Include a pvremove module and pvabsent state
Merge pull request #12695 from holmboe/patch-2

Reflect the latest released version
Return True for volume_detached if volume is absent

Technically it is detached.