Added QueryDownData.py that talks to MongoDB, and grabs beta values
corresponding to a user-specified chromosome. 
GetMongoCursor: a class to get cursors from mongoDB.
MongoDocs: a class to work with cursors after you have gotten it.
PlotBarGraph: takes a dictionary and plots bargraph.
Merge branch 'master' of https://github.com/apfejes/epigenetics-software.git