[#10,all][l]: switch to dataconverters library - all tests passing!.

* modify app.py to use dataconverters
* vendor: submodule or directly incorporate needed vendor libarires
* NB: tsv support has been temporarily lost - will re-introduce asap
* NB: have not yet removed the old transform and brewery code but will do in next few commits.
* NB: as now using messytables should have support for automatic encoding detection which fixes #3 (though have not tested ...)
[test][s]: some small tweaks and change test files to something smaller.