Send a warning when a yaml filename has an underscore #157
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TestSuites are grouped by test runners by the name that is
generated for the tests within. To ease that grouping it is
useful to have filenames with a known set of characters.
Grouping is also used for py.test fixture handling.
This change raises a warning if a filename has an '' in it,
effectively declaring that though it is possible to use '',
it can impact grouping.
Fixes #144