BLD: Update to latest Cython release.

0.19.2 -> 0.20
BLD: Update to latest tornado release.

Used by IPython notebook, update version from 3.1.1 to 3.2
BLD: Add mock to requirements file.

mock was recently added as part of the testing of port of the script
API for algorithms.
BUG: Fix typo in requirements file.

Fix incorrect number of '='