Revert "pr #72"

This reverts commit 1c60743f9df1a41f60436e8633fded2d3d92ab42.
Define Cloak client with UMD pattern

Implement a more explicit mechanism for defining the Cloak client in
both "browser global" environments and Node.js. In addition, implement
support for AMD environments.
Merge pull request #73 from jugglinmike/re-apply-umd

Re apply umd