Adding Jongo as DB ORM starting #63
Changing MongoDB ORM library from Jongo to Morphia. Related to #63
Changing Groundhog's DB support class and adding tests. Related to #63.
Enabling DB support for the Commit class and fixing toString() method.
Related to #63.
Adding DB support for the Project class. Related to #63
Updating README to match brand new database support functionality in the project. Related to #63
Improving GroundhogDB class. Related to #63
Fixing README
Establishing DB relationship between User and Commits and Projects.
Related to #63
Tweaking README
Adding draft of query method. Related to #63
Changing GitHubEntity interface to an abstract class. This will make our MongoDB query interface easier to implement in the near future. Related to #63
Adding database support for some Github entities
Adding DB support for Issues, Licence, Language and Milestone classes.
Merge branch 'database-coverage' of https://github.com/spgroup/groundhog into database-coverage
Fixing some commit problems about database support for classes: User, Organization, PullRequest and Release

A little comunication problem, but now fixed.
Finished adding DB coverage for all Groundhog entities. Related to #63
 Fixing the first part of the bug reported by Irineu (@imlm). There was
 a small re-implementation of the getProjects method in thSearchGitHub
 class.

 It happened that the method was returning a list of malformed Project
 objects, thus causing bugs to happen further in the searches and other
 API calls performed on those malformed objects.

 For example, objects were being created with empty User attributes,
 preventing many further API-dependent methods to crash.
Fixing malformed query URL in two methods from the SearchGitHub class.

I believe this should be enough (just for now) to help @Irineu.