GeoClaw nearly complete for v5.7.0

[rjleveque]

#440 is the last major change to GeoClaw I want to include in v5.7.0, so maybe we can release soon?

There are still some travis issues to sort out on that PR, though the tests all run fine for me.

I just posted a new set of all the docs that have been updated so far to go along with #440 and also #423, #428, and clawpack/amrclaw#258 in particular.

I can't seem to build the dev version of the docs in the usual manner, so instead I've switched to a different way of doing this, see clawpack/doc#209 and the new dev branch temporarily at http://depts.washington.edu/clawpack/sampledocs/sphinx-multiversion/dev/contents.html

In particular, these pages may be of interest:

• flagregions

• ruled_rectangles

• lagrangian_gauges

• fgmax

• set_eta_init

• marching_front

• force_dry

[rjleveque]

v5.7.0 has now been released with all these additions. See http://www.clawpack.org/release_5_7_0.html.