Merge pull request #108 from geekwright/master

Changes to implement control interface to service manager
Merge pull request #109 from geekwright/master

Patching Services
Merge pull request #110 from geekwright/master

Correct service manager contract calls
Merge pull request #111 from geekwright/master

Provide proper status and message from NullProvider.
added "go back"
Merge pull request #112 from mambax7/master

added "go back"
Merge remote-tracking branch 'upstream/master'