* Update Azure Region List
Included several additional regions in the Azure list.
In a future version we may want to ask users to choose a continent, then present region options since this list is getting long.
* Add VM size selection
Added prompt for user to choose VM size. Useful because the default size is not available in all regions, and there are cheaper sizes.
* Handle vm_size choice in "Create an Instance" step
Use the variable passed in that the user chose for vm_size.
* Differentiate Basic A0 and Standard A0
* Remove vm_size D1 since it's being deprecated
* Fix syntax issue - missing semicolons
* Remove note to self comment
* Remove changes to let user select VM size
Removing my previous additions that let the user select their Azure VM size.
* Hard code VM size to cheapest size
Remove my usage of a variable for VM size. Update to use the Basic_A0, which is the cheapest size of VM.
