update readme and changelog
Merge pull request #2325 from guangyang/release-0.7.3

update readme and changelog
Prototype: Support EmulatorExpress
Fill in Cmdlet help document for new added Mode parameter
code cleaning up and unit test
add scenario test for emulator express
Small change to make class method scope consistent
Update test name
Merge branch 'release-0.7.3' of github.com:WindowsAzure/azure-sdk-tools into dev
Merge pull request #2329 from guangyang/dev

from master to dev
Updated to latest compute WAML and updated code for changes.
Merge pull request #2330 from christav/compute-update-and-fix

Updated to latest compute WAML and updated code for changes.
Address all CR feedback except updating all AzureTool derived classes
Adjust other Azure command implementation to have consistent relation with AureTool base class
rework on AzureTool to introudce some static methods per review feedback. Note, this class won't cache static properties, so test parallel running should behave fine [B
use ComputeEmulatorMode as Mode parameter type
Add copyright header on the new code file with ComputeEmulatorMode
Merge pull request #2328 from yugangw-msft/EmulatorExpress

Support emulator express in PowerShell