CLOUDIFY-2431 plugins context initial commit
CLOUDIFY-2431 changed decorator to method invocation because of celery imports problem
CLOUDIFY-2431 raise exception if ambiguity in capabilities
CLOUDIFY-2431 added a cloudify context identifier constant for clarity
Merge pull request #8 from CloudifySource/feature/CLOUDIFY-2431-plugins-context

CLOUDIFY-2431-plugins-context