updated install instructions for 5.0.0rc-beta
more cleanup of installation - use pip install -e ./ but no longer recomment 'pip install clawpack'.  Added AWS instructions.
improved gallery/make_plots.py and fixed documentation in the pyclaw gallery scripts, added README
Merge branch 'pyclaw_gallery_sources' of https://github.com/ketch/doc into install

Testing if I can build galleries for pyclaw.

* 'pyclaw_gallery_sources' of https://github.com/ketch/doc:
  Fix claw_html_root to point to local images.
  Add pages with source code for PyClaw examples.
  Fix paths by removing some extra '/'s.
  Generate source code pages for all PyClaw examples.
added more clawpack/apps/fvmbook examples to gallery
added another fvmbook example to gallery
copy readme and other html files
added script to 'make .htmls' in all example directories
Merge branch 'readme' into install
Includes some recent changes to master

* readme:
  copy readme and other html files
  Make links red so they're easier to notice.
fixes to make_htmls and gallery
Fix path to clawlogo file.
Merge pull request #36 from ketch/logo_file

Fix path to clawlogo file.
Merge pull request #33 from rjleveque/install

updated install instructions for 5.0.0rc-beta