Unregister support for vcenter extension manager

* Support only for unregistration of vcenter extensions.
Update inline type docs

This commit updates the inline type docs. Previously
there was some copy/paste docs issues from
esx_service.
Merge pull request #143 from dscherer/tb/extension

Unregister support for vcenter extension manager
Merge pull request #142 from bodepd/doc_updates

Update inline type docs
Merge branch 'master' into asm_master

Conflicts:
	lib/puppet/type/esx_datastore.rb
Merge pull request #23 from nanliu/asm_master

Update asm master with upstream master