Support Multiple billing accounts & latest stable version installation

Hello,

I have added updates so that the cookbook allows setup of ICE when there are multiple billing accounts.  

At present, version 0.0.3 of ICE does not support this feature.  In order to allow for this, the request also includes a way for user to simply provide "stable" as the version and it will download & install latest stable build right from netflix's build location.

This pull request also has the last pending pull request I submitted. https://github.com/mdsol/ice_cookbook/pull/14

Please let me know if you would rather get some of this in a separate pull request.  I can turn that around fairly quickly.

Thanks,

 - Ankit.