All tests pass. just Require Uniqueness

All current unit tests pass. Now just require, functionality to ensure
SCTIDs generated haven't been generated before.
Requires SQLite
bool isUnique()
string getNextBean() -- gets next bit of string to make an SCTID
Added Basic Repo Methods

Seems to be working.
Problem with AbleToGetNextConceptBean() test, but method actually seems
to work.