Intermittent commit to get screen capture.
Updated screens & text for contributing changes; deleted unused graphics and added alternative text to
newer graphics; edited site-wide installation section.
last_saved_metadata no longer calls logout.
Merge pull request #1440 from crobinsonut/dev

last_saved_metadata no longer calls logout.
Merge pull request #1441 from pziegfeld/sept_cleanup

Sept cleanup - removed old images, added alt.text  for graphics, updated screens for contributing code, minor edits.