updates to documentation for ActivityLibrary

Updating xml comments for RightScale.netClient.ActivityLibrary
Updates to readme.md

doc update
Merge branch 'master' of https://github.com/patrickmcclory/RightScaleNetAPI

Conflicts:
	RightScale.netClient/Packages/RightScaleNetClient/RightScale.netClient.Powershell.dll
	RightScale.netClient/Packages/RightScaleNetClient/RightScale.netClient.dll