various updates
Reorganized changes/release files, added Clawpack 5 to top of page
Increase maximum page width; decrease min width.
improving installation instructions
Keep text away from left edge of browser window.
updated instructions for running first example
Merge pull request #28 from ketch/css_widths

Increase maximum page width; decrease min width.
merged page width changes and added Clawpack 5 to top line
Streamline installation instructions.
Fix typos and link to PyClaw changelog.
Fix underline and put simple install first.
Fix typos, h/t @mandli.
Merge pull request #29 from ketch/updates2

Revision of installation instructions
Instructions for installing without compiling PyClaw.
Merge pull request #30 from ketch/no_pyclaw_install

Instructions for installing without compiling PyClaw.
changed top title to Clawpack-5, but still spans 2 lines on ipad
added docs on fgmax and related changes.
Logo links to index.html

Also allow more space for "Clawpack" in header,
and put full version number in sidebar.
Merge pull request #32 from ketch/logo_link

Logo links to index.html
Merge pull request #31 from rjleveque/fgmax

New docs on fgmax