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Create VM in virtual network's affinity group

Fix for https://github.com/MSOpenTech/azure-sdk-tools-xplat/issues/7
Delete new cloud service when VM creation fails
Fixed issue https://github.com/MSOpenTech/azure-sdk-tools-xplat/issues/11. Added support for VM Images for 'vm image list' command.
update release files
add more change information
mention new php version in changelog
Fix network vnet create command

When an existing network is associated with a location, and not
an affinity group, network vnet create would fail.
Fix vm create in vnet without affinity group

When creating a vm in a virtual network, we would fail if the virtual
network was not associated with any affinity groups.
Fix vm docker create command
Reverting the hostcaching option to default value
Fix vm docker create invalid flags

The commander module doesn't allow short flags longer than one letter

Fixes these issues:
https://github.com/MSOpenTech/azure-sdk-tools-xplat/issues/16
https://github.com/MSOpenTech/azure-sdk-tools-xplat/issues/17
Fix for handling ssh into VM with password
tests for vnet,image list,env vars,docker
adding callback for vmlist
Merge pull request #25 from acharyarajiv/sprint36

Tests for Vnet,Image list,Required env variable changes & docker
docker tests commented from the testlist
Merge remote-tracking branch 'upstream/dev' into sprint36
Fixed up indentation in image.js. Fixed localization issue in vmclient.js
Fixed code review comments for test files for sprint36