Update netcdf4

Weird --- it looks like they reuploaded the same version, but fixed the
directory problem (thus the different hash).
Add pybtex
pybtex: unpack the egg
Add latex encoding to Python
restored freetype dependency in matplotlib

This undoes breakage I made in ef53ce529793701b90bb17816fb2733329967f21

Cygwin and Darwin should use host freetype, it should be built by default on Linux
Update IPython to 1.1
Merge pull request #64 from certik/pybtex

Add Pybtex
Merge pull request #77 from certik/ipython

Update IPython to 1.1
Add pygments to IPython dependencies

This is needed for running "ipython nbconvert".
Add sphinx to IPython run-time dependencies

This is needed for nbconvert to latex.
Update Sphinx to 1.2b3
Sphinx: don't use an egg
Merge pull request #78 from certik/ipython2

Add pygments to IPython dependencies
Merge pull request #74 from hashdist/restore_matplotlib_freetype

restored freetype dependency in matplotlib
added /usr/sbin:/sbin to PATH
Merge pull request #82 from hashdist/osx_sbin_path_fix

added /usr/sbin:/sbin to PATH
removed mumps and hypre as dependencies because they are too fussy to be defaults
Merge pull request #84 from hashdist/simplify_proteus_petsc

removed mumps and hypre as dependencies because they are too fussy
added link flags to numpy recipe on cygwin and commented out pyzmq test
Merge pull request #85 from hashdist/cygwin_hacks

added link flags to numpy recipe on cygwin and commented out pyzmq test