Relational models between orm objects unfinished

While the relationships between tokens and meeting date table
are functional; a new insert query error arises when attempting
to create new Token rows.
Incretive improvement on Token(Link) db loading

Tokens now being loaded into database from text.  TokenLinks still to be
finished.  Functionality being prototyped in test_loading.py Tests.
Prototype of saving TokenLinks to database working

Still only working in a UnitTest but it's prototyped and ready to be
abstracted into it's own functions.
Adding Unique indexes to tables

Generated unique indexes from sqlacodegen.
Abstracting Tokenization database loading ops

Functions defined to insert Token and Tokenlink objects into their
respective database tables.
Cleaned up Token db testing with new functionality
Fully abstracted tokenization and linking function

Creation of Tokens and TokenLinks now abstracted into parameterized
functions which load data into the database.
Simplified general text processing into function