npm support

Hello John,

My team does a Crodova 3 application development and we leverage npm approach to add vicarious frameworks and libraries - because of a number of reasons. I updated your beautiful wrapper for Flurry plugin so that it can be added through npm.

If you decide to accept this pull request please review the package.json so that meta-data is correct there and also publish your package to npm repo. Here is a tutorial for that just in case:
https://gist.github.com/coolaj86/1318304
I need you to do the publishing so that you retain authorship.

Changelog:
Moved JS implementation of the plugin from iOS folder to root
Deleted the duplicate JS file in android folder
Updated read me file
Added support of node.js global object in addition to browser window

Best regards,
Ivan Karpan

P.S.: thanks a lot to @Narsul for helping me through this hard quest