Otherwise it becomes difficult to manage on a few dimensions:
* the code to do it is complex
* the readability of the test is damaged
So now the default dict is validated. If it has uppercase keys a
GabbiFormatError is raised. A non-gabbi test for this has been
added, along with a test for duplicate METHOD keys in one test.
The existing method_shortcut.yaml tests have been updated to reflect
the change in defaults.
Some further cleanups on the tests are probably required and docs are
still missing, but this is almost working.
e647a843cd
