Scale accordion pane

The accordion pane scales to the page height to (mostly)
elimante the need to scroll down to accordion sections and
utilize all the vertical space.
Added min-height for accordion-container

The accordion will scale to page height, but no
smaller than 400px. This way even if the page is
small it is still usable.
Merge branch 'master' into accordion-scale
Merge pull request #179 from KSHSK/accordion-scale

Scale accordion pane