[CentralOH] IPython Installation

[jep200404 at columbus.rr.com]

Several local folks have already been using IPython, or have 
started using IPython and pandas recently because of the newly 
published "Python for Data Analysis"[1]. At least one person 
had difficulty installing pandas and/or ipython with pip 
in a virtualenv under Centos 6.3, so here's a recipe for such. 

Some of the following system packages might not be necessary.
Also, more system packages might be required that are not listed below.
Please post corrections. 
sudo yum install python-devel
sudo yum install gcc-c++
sudo yum install freetype
sudo yum install freetype-devel
sudo yum install libpng-devel

virtualenv env
source env/bin/activate
pip install numpy
pip install matplotlib
pip install pandas
pip install ipython

[1] Python for Data Analysis
    Wes McKinney
    O'Reilly
    978-1-449-31979-3
    Jason Conaway might be particularly interested in Chapter 11.