Load blob.js along with filesaver.js to fix Export Schema option in Safari 7

Hello,

Apologies for the previous pull which ignored the contributing...

CLA is signed. Please be aware, however, that blob.js is not my work. It is found here:
https://github.com/eligrey/Blob.js/

It is the same author of the current filesaver.js Kibana is using. The specific file I have used is the one from his demo site here:
http://eligrey.com/demos/FileSaver.js/

Reason for using the revision from demo site is that it is known to work. I know the FileSaver.js current master has issues (does not work at all in Safari 7 for me) but the demo site still works great in Safari 7, and in fact uses the same FileSaver.js version Kibana is using as far as I can tell. So I took the Blob.js from there.

Will I need to get in touch with eligrey for you so he can confirm this contribution? All I've done is tie the parts together. He maintained all of the blob.js itself.

Thanks!

Jason