Hotfix to build QGIS on OS X 10.9 added, update to 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:
https://github.com/mxcl/homebrew/pull/23793

It also requires applying the updated formulae for Qwt and PyQt at:
https://github.com/mxcl/homebrew/pull/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:
https://github.com/qgis/QGIS/pull/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 This will quickly fall out-of-date of the main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!