Added pandas library for time series calcuations.  This library needed
to be packaged as binary because the build process would be too lengthy
and would likely timeout the elastic beanstalk deployment.  pandas was
built against AMI: amzn-ami-pv-2013.09.0.x86_64-ebs (ami-d03ea1e0)
following the instructions here:
http://wheel.readthedocs.org/en/latest.