bug fix in gui filemanager
add gui functional test for 'Open in Browser' file context menu option
fix comment
Made some punctuation/format changes, mainly to openmdao.gui srcdocs, but a few to other srcdocs pkgs.
fix filemanager test
Merge pull request #1430 from pziegfeld/Aug_srcdoc_edits

Made some punctuation/format changes, mainly to openmdao.gui srcdocs, but to a few other srcdocs.
Merge pull request #1431 from swryan/gui

Gui
copy PNG file to test directory and use from there to fix release test
Merge pull request #1432 from swryan/gui

copy PNG file to test directory and use from there to fix release test