testing: No such file or directory spore_validation.rx

[offlinehacker]

When packaging cornice based on source on pypi on nixos linux distro all tests runs fine, execpt this one. Plase check your MANIFEST.in

ERROR: test_rxjson_spore (cornice.tests.ext.test_spore.TestSporeGeneration)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/nix-build-python2.7-cornice-0.16.2.drv-0/cornice-0.16.2/cornice/tests/ext/test_spore.py", line 83, in test_rxjson_spore
    with open(os.path.join(HERE, 'spore_validation.rx')) as f:
IOError: [Errno 2] No such file or directory: '/tmp/nix-build-python2.7-cornice-0.16.2.drv-0/cornice-0.16.2/cornice/tests/ext/spore_validation.rx'```

[leplatrem]

spore gone in #373