Update jquery.blobuploader.js

Thank you for this excellent code. I just saw few minor bugs. I will maby test this more later.
Merge pull request #1 from kjartanvalur/patch-1

Update jquery.blobuploader.js, Thank you @kjartanvalur,  I created a new repository which can manage blob not only by SAS url but also by storage account name and security key. check it out: https://github.com/orcame/jazure if you are interested.