Added VectorTypeFor and MatrixTypeFor aliases to DimensionTraits.
Added VectorTypeFor and MatrixTypeFor aliases to DimensionTraits.

Also a new gem we can use with GCC 4.7.

DerThorsten/magnum,MiUishadow/magnum,DerThorsten/magnum,ashimidashajia/magnum,DerThorsten/magnum,ashimidashajia/magnum,MiUishadow/magnum,DerThorsten/magnum,MiUishadow/magnum,MiUishadow/magnum,ashimidashajia/magnum,MiUishadow/magnum,DerThorsten/magnum,ashimidashajia/magnum,ashimidashajia/magnum,MiUishadow/magnum