Revert "update for Cordova 2.4+"

This reverts commit 141240cc9b4ab4977a58598c160cddd9af205cc7.
Revert "switch to Cordova NSData+Base64"

This reverts commit 16e0948d50519f28202639f3b8c824547d6d221e.
Revert "updating the readme"

This reverts commit e0dec076f02c6060c07b52079c8af553d3999fac.
Revert "add support for blobs"

This reverts commit 071af8d189a32d3e8e57f74f4218282444769f84.