Add GpuGer to gpuarray.
Fix some problems and add some tests.
Add a failsafe in the inplace C code to make a copy if required.
Add more tests for Ger.
Add fallback copy to the inplace C code for all gpuarray blas ops.
Add more tests for GpuGemv.
Remove the restriction on alpha and beta dtype in gpuarray blas ops.
Merge pull request #1800 from abergeron/gpuarray_ger

Add GpuGer to gpuarray.