Updates to some of the Riemann solvers
5.2.1rc
updated geoclaw
Merge branch '5.2.1rc'

* 5.2.1rc:
  updated geoclaw
  5.2.1rc
5.2.1rc-beta
add pyclaw changelog and sill example
merged changes to geoclaw/tests/storm_surge
5.2.1rc-gamma
fixed common block names in 3d Burgers example
Merge pull request #48 from rjleveque/5.2.1rc

5.2.1rc-beta