checkpoint on new handler for bitstreams that are xls and xlsx
adding docs
renamed docs files
renamed wiki docs files
further updates to wiki docs
note to add status box to wiki docs
added dc.source and dc.extent to bitstream handler code; fixed issue in unit tests where test server port is reported in dc.source, but changes between test runs
added bitstream handler for jpg, png
Merge branch 'handler-image'

Conflicts:
	dryad-widgets-webapp/src/main/webapp/aspects/widgets/display.xmap