remove parts of page that aren't needed anymore, start adding new format
style tweaks
update look of button
add phet-airplane to button, see #16
Merge branch 'master' into front-page-tweaks

Conflicts:
	root/css/home-v6.css
	src/java/edu/colorado/phet/website/StringChanges.java
	src/java/edu/colorado/phet/website/content/IndexPanel.html
add phet-ariplane image to git; add for-teachers link back to index, see #16
add social icons to index page
add new social icon images, see #16
work on play with sims button, see #16
format new page items using a table; reformat index html file, see #16
add social icons to bottom of index page, see #16
add sponsor section, see #16
add web and wicket frameworks to iml file
fix sponsor typo, see #16
add new js video player, see #16
add support for multiple video formats for FF, see #16
add links to video player, see #16
update social icons to change on homepage vs other pages, see #16
make social text translatable; make newletter link a linker, see #16
make video clickable