Merge pull request #27 from ahellander/develop

Develop
Fixing unit tests and removing run_ensemble()
renamed functions in URDMEMesh
more fixes to renamed function for URDMEMesh
fixed function names for URDMEModel, addresses issue #87
Converting all funciton names in the base Model class
Merge pull request #91 from briandrawert/test_seed

Renaming functions with underscores