Some updates

Change joshcooper powershell module to puppetlabs powershell module
Remove warning when set bindings
Add flag for choosing if we want to manage bindings without managing
sites
Refactored flag to remove cmd duplication allowing manage_binding to be used without managed site, added tests
Updated exec commands to use powershell provider
Reverted powershell dependency module change - planned and will be done for all modules shortly
Merge branch 'ninja-2-master'