Support for pasting images using IE

[Daniel-Svensson]

Please add support for internet explorer at least using IE 11.

This has already been requested in #4 and #7, but it was mostly mentioned that it does not work.

You can quite easily detect which browser is used in JavaScript and the Explorer support seems quite simple to implement, they even have a small example on how to use the clipboardData oject at http://msdn.microsoft.com/en-us/library/ie/ms535220(v=vs.85).aspx