Linalg

Moved linalg function using numpy to nlinalg.py in theano.tensor.
http://docs.scipy.org/doc/scipy/reference/generated/scipy.linalg.pinv.html
http://docs.scipy.org/doc/numpy/reference/generated/numpy.linalg.pinv.html
From what we can read in their respective doc, scipy offers more option and return the matrix rank along with its pseudo inverse.