Have travis build and post docs

For testing purposes build on every push to synthicity/pandana.
After that's confirmed it'll only build on non-PR builds of the master branch.
Make sure conda is up-to-date.
Uncomment all the checks for a production test.
Merge pull request #14 from synthicity/travis-build-docs

Have Travis Build Docs

Will build and post when the following conditions are true:

- build is not for a pull request
- build is on the master branch
- build is on the synthicity/pandana repo (as opposed to a fork)