Junit xml reporter grouping by classname

[PaulTaykalo]

Junit reporter will generate unique testcase "classname" attribute from original filename.

<testcase classname="Cedar" name="Some test" time="0.002539"/>
<testcase classname="Cedar" name="Yet another test" time="0.090917"/>
<testcase classname="Cedar" name="Third one" time="0.090917"/>

became

<testcase classname="MySpec" name="Some test" time="0.002539"/>
<testcase classname="MyAnotherSpec" name="Yet another test" time="0.090917"/>
<testcase classname="MyAnotherSpec" name="Third one" time="0.090917"/>

When it's not possible for some reason to resolve filename from Spec, it will fallback to default "Cedar" classname

Related to #171

[PaulTaykalo]

That wasn't a good idea to merge with master branch

[jeffh]

Yeah, @idoru cherry-picked my memory leak PR which caused that crash. I was going to fix it up but thanks for doing it @PaulTaykalo.

[idoru]

Yeah, my bad, I'm still remembering how to write software properly again after a 1 month vacation. Thanks for fixing that up @PaulTaykalo.

[PaulTaykalo]

np.
I just though that you wouldn't accept a build that fails on Travis :)
I didn't have a choice.