Merge pull request #11 from MSOpenTech/dev

Merging dev to master for 0.1.6
Update README.md
Merge pull request #1 from MSOpenTech/master

Pull from source repo
Add caching to the acquireTokenWithClientCredentials method.
Update the version number.  This version includes support for caching tokens retrieved from acquireTokenWithClientCredentials
Add a change log file.
Merge pull request #14 from RandalliLama/master

Add caching to the acquireTokenWithClientCredentials method.
Merge pull request #19 from AzureAD/dev

Version update to 0.1.7
Merge branch 'master' into dev

Conflicts:
	changelog.txt
Merge pull request #20 from RandalliLama/dev

Merge master branch back in to dev.