Add pre/post stages into graph stored in library
Add pre/post stages into graph stored in library

Required for nailgun to operate on graph

implements blueprint granular-deployment-based-on-tasks

Change-Id: I79b5b33c44efb6e6fb4c9a110e2394cafef693dd

huntxu/fuel-library,zhaochao/fuel-library,xarses/fuel-library,stackforge/fuel-library,SmartInfrastructures/fuel-library-dev,SmartInfrastructures/fuel-library-dev,xarses/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,eayunstack/fuel-library,eayunstack/fuel-library,stackforge/fuel-library,huntxu/fuel-library,stackforge/fuel-library,ddepaoli3/fuel-library-dev,xarses/fuel-library,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,zhaochao/fuel-library,SmartInfrastructures/fuel-library-dev,xarses/fuel-library,huntxu/fuel-library,huntxu/fuel-library,zhaochao/fuel-library,ddepaoli3/fuel-library-dev,huntxu/fuel-library,zhaochao/fuel-library,SmartInfrastructures/fuel-library-dev,ddepaoli3/fuel-library-dev,eayunstack/fuel-library,stackforge/fuel-library,SmartInfrastructures/fuel-library-dev,zhaochao/fuel-library