Install packages necessary for netlib.
Hopefully correct package name. Also try sbt_args for netlib.
Try caching SBT dependencies.
Merge pull request #104 from crealytics/travis_ci

Enable automatic builds with Travis CI
Add more tests for PQN.
Add Projecting trait for use in PQN and SPQ.
Make code more similar to original MATLAB version.
Make SPG more similar to original MATLAB implementation.
Use improvement over history as termination criterion in FirstOrderMinimizer.