Revert "Added script to properly start the MongoDB in elara's environment, without sudo requirements"

This reverts commit 5cd3e87e90bb37c7059ef14579859c7dc95e121f.
Revert "Changed project to use MongoDB and Mongoid. Added mongoid-matchers as well, but they"

This reverts commit 3c03d1d9619ee6c4218c9d3e2d2e166a0897f900.