fixed out3.f to print out num_dim, needed for reading into python
added 3d regression test
added setup and teardown to tests
changed .travis.yml to execute nosetests rather than make tests
Removed rp*f and fixed Makefile to point to riemann repository in annulus example
Merged in changes from PR#54 where @donnaaboise added .m files
Merge branch 'master' into fix_tests

* master:
  acoustics_3d_heterogeneous : added Matlab files and ran example
  advection_2d_annulus: Added Matlab files and test example
  acoustics_2d_radial : added Matlab files and tested example
  acoustics_1d_heterogenous: added Matlab files
  acoustics_1d_example1 : Fixed line style
Merge pull request #56 from rjleveque/fix_tests

Added 3d regression test and fixed other tests and travis file