CFY-203 added delete deployment command
Update README.md

added docs for delete deployment command
CFY-145 inject min/max agent workers and agent key path to cloudify provider context
CFY-203 improved a unit test
Merge remote-tracking branch 'origin/feature/CFY-203-add-delete-deployment-REST-API' into feature/CFY-203-add-delete-deployment-REST-API
Merge pull request #15 from cloudify-cosmo/feature/CFY-203-add-delete-deployment-REST-API

Feature/cfy 203 add delete deployment rest api
Merge pull request #16 from cloudify-cosmo/feature/CFY-145-provider-context

Inject system bootstrap configuration to provider context
Merge branch 'feature/CFY-642-workflow-framework' into feature/CFY-645-store-wf-execution-in-storage