This frees us up to enforce one single point of access, thus paving
the way towards allowing us to initialize the models at are request,
and not when it's require().
addresses #2170
closes#2354
refs #1641
- added addUnique()
- added dropUnique()
- added addColumn() -> needed for #2330
- dropColumn() is missing due to lack of knex support
- further cleanup of the migrations module
Closes#2927
-refactor exporter to export tables that exist in the
database instead of keying off of schema.js
-move some shared database utility functions into their
own module
