Clean installed packages before CI sdist install (#20)
Clean installed packages before CI sdist install (#20)

* Clean installed packages before CI sdist install

* Install dev requirements before running tests
spacy-io/murmurhash,explosion/murmurhash,explosion/murmurhash,syllog1sm/cython-murmurhash,explosion/murmurhash,spacy-io/murmurhash,explosion/murmurhash,syllog1sm/cython-murmurhash,spacy-io/murmurhash,syllog1sm/cython-murmurhash