Support tinytext on MySQL

[tmountain]

Required Functionality When I try and run synth on a database schema that contains a table with a tinytext column, I get the following message.

Error: We haven't implemented a converter for tinytext

Proposed Solution Synth should support tinytext.

Use case We have a large schema that we'd like to use in conjunction with synth. I'm certain other users are working with schemas containing this datatype. Ideally, all types should be supported.

[tmountain]

Refining this request:

mediumtext, longtext, mediumblob, blob, tinytext, and bit are unsupported

This is preventing us from using synth.

[nickygb]

It could help if we could ignore failing tables #381 and create them manually.