- added support for zipped amf files (using jszip)
 * parser will always attempt to read compressed raw data, if it fails, it falls back to simple text
format reading (xml)
 * added helper methods (ensureString etc) to coerce into plain text if data is not a zip file
 * added browser side demo in specs (node side in progress)
 * added demo files
 * small fixes and cleanups

- cleaned up package.json
- removed useless files
- moved all test/spec/demo data to data subfolder
- fixed missing dependencies in package.json
- cleaned up / fixed jasmine node side test : all ok, for compressed and uncompressed amf files
 * basic tests only for now