Latest code release: new library, rounding, tests, experiments, docs.

[keevindoherty]

This PR adds:

• New library code for Fiedler value computation, subgradient optimization, randomized rounding.
• New example code for running the MAC algorithm and evaluating its performance
• Updated documentation
• New tests

Migrating the latest results from the MRG development repo for release.

We should go over everything one more time to do any last clean up, but otherwise I think we are good to go.

cc: @alanpapalia