Match extensions regardless of case.
utf8 support

Hello, with this we can now upload files with letters like ąčęėįšųūŽ etc.

Thanks
<XMLHttpRequest> has no method 'sendAsBinary' #142
Merge pull request #156 from havenS/master

<XMLHttpRequest> has no method 'sendAsBinary' #142
Merge pull request #155 from huglester/patch-1

utf8 support
Merge pull request #146 from amnuts/master

Match extensions regardless of case.
Merge remote-tracking branch 'remotes/weixiyen-original/master'