Increasing test coverage for mods
Merge pull request #22 from jrhoads/r-increase-coverage

Increasing test coverage for mods
Specifying that travis should install lxml as a system package and then use it instead of building lxml each time.
Changed the order in the travis.yml file
Fix typo in travis.yml file
Trying an environmental variable to speed up the build
Merge pull request #24 from jrhoads/travis-lxml-install

Speed up travis-ci