Log Message:

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Version 2.2.0 (March 01, 2013):
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New Features
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- Added Support for Windows

- New Bloch3d class for plotting 3D Bloch spheres using Mayavi.

- Bloch sphere vectors now look like arrows.

- Added partial transpose function.

- Added continous variable functions for calculating correlation and covariance
  matrices, the Wigner covariance matrix and the logarithmic negativity for
  for multimode fields in Fock basis.

- The master-equation solver (mesolve) now accepts pre-constructed Liouvillian
  terms, which makes it possible to solve master equations that are not on
  the standard Lindblad form.
  
- Optional Fortran monte carlo solver (mcsolve_f90) by Arne Grimsmo.

- A module of tools for using QuTiP in IPython notebooks.

- Increased performance of the steady state solver.