pre-5.2 release update for travis tests
my clawpack/pyclaw master branch was out of date
for travis, run nosetests in pyclaw/examples
update for v5.2.0 release
Need to set PYTHONPATH for travis to find geoclaw etc.
Change travis to do 'pip install -e .' instead of running 'python setup.py install' because setting PYTHONPATH now points to an unbuilt version of pyclaw rather than the one in site-packages...
Note that this is probably an issue for some users and needs to be addressed.
Merge pull request #43 from rjleveque/5.2.0

5.2.0
Update version to 5.2.0
Merge pull request #45 from clawpack/ahmadia/update-5.2

Update version to 5.2.0