Merge pull request #38 from mandli/master

Update AMRClaw and Clawutil to versions for 5.2
Add CITATION file for basic citation instructions

Based on the citation page in the docs for Clawpack at clawpack.org and
pyclaw.org.
Change name of CITATION so github renders it
Update CITATION file to look good rendered
Merge pull request #40 from mandli/add-citation-file

Add CITATION file for basic citation instructions
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my clawpack/pyclaw master branch was out of date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