Fix version number in setup.py to 5.1.0
Merge pull request #37 from rjleveque/5.1.0-final

Fix version number in setup.py to 5.1.0
Update AMRClaw and Clawutil to versions for 5.2

Includes support for aux-copying and other additions to AMRClaw.
Clawutil includes a number of tweaks to data interfaces.
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
Updating pre-5.2 release to check that cross-repository travis tests work.