Remove Mercurial cruft

[ghost]

Fixes #8 .

[tarrow]

Just clean up. Files are actually deleted

[tarrow]

So, I don't understand why this is broken.

Travis continuous-integration/travis-ci/push is trying to pull from contentmine/cleanup-mercurial. I don't know why. IMHO It should be pulling from contentmine/master.

contentmine/cleanup-mercurial doesn't exist --> travis fails to even clone the code

What am I missing?

[ghost]

@tarrow , thanks for trying to merge this PR :)

With any luck, the Travis oddness will be resolved when ContentMine/meta#4 is fixed. At that point (hopefully next week some time), we can revisit any outstanding PRs in the AMI stack.

In the meantime, if any of us really wants to merge each others' feature or bugfix branches into our own trees, we can do so directly from each others' remotes into our local repositories. (In the case of such minor improvements as this one, it's probably not worth even doing that, though.)