Read .coverage file in the tests directory.
Add missing hyphens to .travis.yml
Merge branch 'develop' of https://github.com/theupdateframework/tuf into develop
Update slow retrieval server and attack.

Ensure the target file used in the slow retrieval attack is larger than tuf.conf.SLOW_START_GRACE_PERIOD.  The previous size of the test file might have led to inconsistent triggering of a slow retrieval error.
Merge pull request #208 from vladimir-v-diaz/develop

Trigger coveralls and update slow retrieval server and attack