[WIP] Matrix and Vector classes

In 2011 I created a [proposal for a Zend_Math namespace](http://framework.zend.com/wiki/display/ZFPROP/Zend_Math+-+Walter+Tamboer) to be used within ZF1. When ZF2 was in development, I created [another proposal](http://framework.zend.com/wiki/display/ZFDEV2/RFC+-+Math) for such a namespace. We now have a BigInteger and Rand class in this namespace. I created a Matrix and Vector class which will fit perfectly in this namespace as well.

I listened to the comments given in my proposals and created two Utils classes (MatrixUtils and VectorUtils) which contain static operations in order to create new value objects.

Note that this is work in progress. I'm creating this PR because I would like to get feedback.