more detailed install instructions

[bjarthur]

the issue comes up often enough, that i wonder whether it's worth being more explicit. specifically, saying that on OS X, you can not use the default python install, even though it has matplotlib, because it does not use Qt. rather you should install a second copy of python using homebrew. on 10.9 mavericks do as follows:

brew install python
export PATH="/usr/local/bin:$PATH"
export PYTHONPATH=/usr/local/lib/python2.7
pip install numpy
brew install gfortran
pip install scipy
brew install pyqt
brew install freetype
ln -s /usr/local/Cellar/freetype/2.5.3_1/include/freetype2/ /usr/local/include/freetype
pip install matplotlib

[stevengj]

Probably you can still use the default Python install with IJulia?

[bjarthur]

the default python install does not include ipython. so one either has to go the anaconda/ijulia route, or the homebrew/julia route. either way, there are enough posts in the forums from people having problems that it would be beneficial to include more detailed instructions in the docs.

[stevengj]

Sounds reasonable. Can you submit a PR?