committing Credential 1.0 calls

closes #109, closes #108, Addressing credential 1.0 calls and
Implementation for Credential itself
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