Add possibility to access the processed data as DataView/ArrayBuffer

[GoogleCodeExporter]

I'm glad to see that you implemented the creation of WordArray objects with 
typed Arrays as input parameter.

I think there should be a possibility to access the (processed) data contained 
in a WordArray as a typed Array/DataView/ArrayBuffer, too.
So you could save bandwidth when sending larger amounts of data that have been 
processed by CryptoJS by simply sending the binary data instead of a string 
which contains Base64 encoded data.

The conversion between the word array and the ArrayBuffer might not be that 
performant, but i like it better than  handling huge strings and blowing the 
input data at almost 1 1/2 of the original size.

Original issue reported on code.google.com by fc.kl...@googlemail.com on 17 Jan 2013 at 11:26