Hotfix to build QGIS on OS X 10.9 added, update to QGIS 2.0.1

This hotfix gets qgis built and working on Mavericks after reinstalling
Qt, PyQt, Qwt, PyQwt, spatialindex, and grass. This requires using
an updated formula for Qt at:
mxcl/homebrew#23793

It also requires applying the updated formulae for Qwt and PyQt at:
mxcl/homebrew#24409

Getting qgis to build with homebrew with this PR for qgis.rb requires
--HEAD.

VERY IMPORTANT NOTE: this installs a custom version of QGIS master
branch
with an updated version of QwtPolar, which broke the build against Qwt
>= 6.1.

This has been opened as a PR for QGIS at:
qgis/QGIS#996

Use at your own peril! This will quickly fall out-of-date of the main
QGIS development branch. If the QGIS development team accepts the PR, I
will update this formula in a new PR for homebrew-science that points
again to the main QGIS repository for HEAD building.

Fixes issues found in #446, for now!