Transform matrix for IE

[cornedor]

IE10+ returns a matrix3d instead of matrix. Changed the regex to also check for matrix3d and convert matrix3d to a 'normal' matrix

[niklasvh]

All the test cases in tests/cases/transform/ return matrix for IE11, could you provide an example case where IE returns matrix3d where other browsers return matrix?

[cornedor]

http://jsbin.com/bebuwugeru/1/edit
Will render to:

EDIT: The test cases just use transform: rotate(); while in my case i used transform: rotateZ();

[niklasvh]

Thanks, merged!

[usmonster]

Looks like this either breaks a test on Chrome, or the test is flaky:
https://travis-ci.org/niklasvh/html2canvas/builds/53498104#L865

(I'm thinking the latter, since it seems the connection was closed while the test was waiting for feedback..)