Making sure is, not, null works

The default behavior for tokens is now to be on a single line, so I'm
adding a bunch of tokens that need to be on the same line.
The ~DROP TABLE~ command works a little better now

I added interpreters for drop and table which makes the drop table
command look a little cleaner now.
Create Table

Making the code for table creation look the way I like.  Also adding
some test cases.
updating readme