removed mongoose user where not in use.

[alexbodn]

hello my friend,

i'm eager to build on your solid base,
but i have to stay away from the better computer on my desk (after an accident),
so my db will be sequelize with sqlite on my chromebook.
this is my first commit, the next will wrap mongoose in a driver (that i can't test)
and, finally the commit with the sequelize counterpart driver.

best wishes,
alex