example : add timer
Add a 0xFF mask when adding a binary file
Fix unit tests on older browsers

Tested browsers :
IE 6/7/8/9
Firefox 3/3.6/4/10(esr)/17(esr)
Chrome latest
Safari 5.1/6

I updated jQuery because it seems to fix an issue with some zip files...

Add JSZip.support because testing support might be hard.
Example : typeof Blob !== "undefined" is not enough : Firefox 4 and
Safari 5 know about Blob but not how to create them (no Blob
constructor, no BlobBuilder).
With a JSZip.support.blob, I can use it in the unit tests and the user
can use generate() or asBlob() without any try/catch blocks.
issue #23 feedback

* use type instead of responseType
* deprecate generate({base64:true})
* improve documentation