remove the unnecessary lib path and package_dir specification

[ryanpetrello]

this also fixes breakage of pip install -e .

[coveralls]

Coverage remained the same at 98.408% when pulling cf1d6ea on ryanpetrello:master into 0b2a22d on ansible:master.

[AlanCoding]

Travis says that it passed, but if you click into it, it looks like other python versions are failing. Those look slightly familiar, but I don't see them on other recent pull requests. I might re-run the tests in a second to be sure.

EDIT: yes, I think that was the case, sorry for the noise.

[AlanCoding]

maybe it had a stale link. I had seen https://travis-ci.org/ansible/tower-cli/builds/206680594, but maybe this isn't the most recent.

[ryanpetrello]

The most recent build I see seems to be passing: https://travis-ci.org/ansible/tower-cli/builds/206686598

[AlanCoding]

Relatively big change, but that sounds good it for the 3.1 release.

[jangsutsr]

@ryanpetrello My salute to you! A lib directory is so confusing (a dynamic runtime library in a Python repo?) and I've always wanted it removed 👍