The exception message, when shade fails, will contain much more
specific information about the failure if the exception is treated
as a string. The 'message' attribute alone is usually not helpful.
* Add python>= 2.6 to documented requirements when a module's deps need
python>= 2.6 so we know when a module can use python2.6+ syntax
* Remove BabyJSON usage
* Change modules to use if __name__ == '__main__' so that they can
potentially be unittested
The BabJSON changes Fixes#1211
Do not attempt to attach an already attached volume.
Likewise, do not attempt to detach a volume that is not
attached.
This version adds support for check mode.
