added BLAS wrapper stuff
changed data layout of General and GeneralCmplx
removed checks vor individual arguments in the wrapper functions
added dimension checks for level 2 and 3
moved blas wrapper into dblas and zblas, zblas still needs cleaning up
made zblas work
renamed packages
added Slice method to Vector
removed numerical type prefix from blas functions
forgot some checks in level2
adding changes to zbw package
Merge pull request #3 from gonum/blaswrap

Merge blas convience wrapper with blas