Fixed error in code
FIXED: Bug in RCM node sorting

Added test to verify
Merge pull request #193 from anubhavvardhan/master

Fixed error in code
max->np.max and PEP8 fixes
Merge pull request #194 from nonhermitian/master

FIXED: Bug in RCM node sorting
SS updates

- Set use_rcm=False by default and use COLAMD ordering by default.

- Fixed bug in power method.
check for integer input in maximally mixed state
force input to be int

conforms to the input criteria for maximally mixed state
merged Paul's PR 95
use 1d arrays instead of 2d array of shape [N, 1] for rhs in solving linear system (the sparse solver requires this)
Merge branch 'master' into qutip-3.0.X
restore distinction between release/non-release in cython file handing in setup.py (could not find a good config that included the pyx files in the source distribion file produced by setup.py)
Merge pull request #196 from jrjohansson/fix-setup-cython

restore distinction between release/non-release in cython file handing
Merge branch 'master' into qutip-3.0.X