Merge pull request #102 from yugangw-msft/dev

Integrate from public Xplat to Xplat-pr
initial commands skeleton
fix up bad code caused by copying and pasting
display role definition in correct format
prototype for role assignment
prototype code for create role assignment
retrieve tenant gui correctly
Merge branch 'dev' into pas
use object id associated with the principal
Merge branch 'pas' of github.com:yugangw-msft/azure-sdk-tools-xplat-pr into pas
create a new file to contain all temporary workarounds
add definition show command
fix a jshint error
add unit tests for role definitions
add barebone implementation of role assignment
delete an empty line
add new environment for graph ppe
use environment setting for graph access
fix up error in the graph call
enable batch query user ids by using the latest graph api of getobjectsbyobjectids