DbHelper extending SQLiteOpenHelper created.  Creation statements and db design underway.
Table creation statement implemented.
HCDbTable abstract class providing interface to get creation statements and table names for various db tables introduced.
HCDbTable interface changed such that getTableName(), getPrimaryKeyColumnName(), and getCreationStatement() all implemented in HCDbTable and subclasses only specify attribute names in their constructors.
Merge branch 'feature/db_introduction'