Import TestTML.pm from another branch
Got TestMLTiny working right.

Everything is now in it's right place:

Files are:
  - t/lib/TestMLTiny.pm
  - t/testml/basic.data.tml
  - t/25_testml.t

* testml test files go under t/testml
  * Files live canonically in ingydotnet/yaml-spec-tml
  * Copied by hand whenever. No submodules.
* t/lib/TestMLTiny exports handy functions for getting testml data
* TestMLTiny has no YAML::Tiny test code in it.
  * Could possibly become a real TestML::Tiny
* The code in *testml.t files does all the tests in your own Perl
  * But gets all the data flow from TestMLTiny.
  * You can take ful control in .t or rely on TestMLTiny part you like
  * No bridge file was needed.
* Subtests work as expected.
attempt to remove submodules