Add Support for Setting Azure Location for Testing and Upload Pester Test Output Artefacts - Fixes #19 #20

[PlagueHO]

This PR addresses:

• Fixes #19
• Fixes #20

The main issue I ran into when creating a config using this pattern was that my Azure subscription for some reason didn't allow me to create the VMs required to execute the automated tests in the default EastUS2 data center. So I needed a way to override the location.

I also find it useful to upload the Pester test results into AppVeyor as files I can download and distribute (as we do with DSC Resource Kit).

As I was also making changes to this, I thought a Changelog should also be included in the README.MD so I added one.

This PR changes:

• README.MD:
  • Fixed markdown rule violations.
  • Added Change Log.
• Added support for specifying the Azure Data center location to use by defining the $ENV:Location environment variable. Will default to 'EastUS2' if not specified.
• NUnit Pester Test results uploaded to AppVeyor as artifacts.

---

This change is 

[msftclas]

@PlagueHO, Thanks for having already signed the Contribution License Agreement. Your agreement was validated by Microsoft. We will now review your pull request. Thanks, Microsoft Pull Request Bot

[PlagueHO]

Tagging @zjalexander and @mgreenegit as per DSC community call instruction.

[johlju]

I have made a bunch of fixes that I can send in, but I need this one to merge first, because I'm dependent on this one. Commits that are pending to be sent in; https://github.com/johlju/DscConfiguration.Tests/commits/fixes-issues

[johlju]

This PR is pointing to merged into master, shouldn't it be merged into dev first? See issue #30.

[mgreenegit]

Looks good. Thank you!