Revert "Revert "add support for blobs""

This reverts commit 469c40480184c3b740f548a348a723722e3fb7df.
Revert "Revert "updating the readme""

This reverts commit 5deaa29f518f479b1bb22e19f945a33bf063e052.
Revert "Revert "switch to Cordova NSData+Base64""

This reverts commit 592b900aee74b526e4d605c13ba163c6d9d2f2df.
Revert "Revert "update for Cordova 2.4+""

This reverts commit cae38cc9140205834199c1d5453a333773e9e23f.