Created a new class called MongoQuery which stores the data used and
retrieved in a query.
Changed the default value of the "database" and "collection" attributes
of MongoCurious to "None". Value must now be specified when class is
used.
MongoCurious succesfully stores query parameters by creating instances
of the MongoQuery class.
The svg() method can now output either an svg file or an svg string.
Added a __repr__ attribute to MongoQuery.
Merge branch 'master' of https://github.com/apfejes/epigenetics-software.git
Added an __repr__() method to MongoQuery.