First pass at content for new three panel layout on home page
Oops. forgot to update tests
remove double margin and control width of frontpage statement

fixes #806
make panel 'reuse' panel more compelling.
Make 'edit' panel more emotive
Cram more 'why' into the 'discover' panel

'Share' part of the sentence is still not right.
change panel headings to semantic heading level
expand panel section to cover 100% width
provide new front-page scss partial (scss only)
remove small side padding from panels container

 (scss only)
fix typo 'representating'
Shorter more evocating title for panel 1
increase + even the spacing of front page content
make 'rereuse' panel title action focused like the other two
get panels out of header and remove page container
increase padding of panels section
make front panels narrower on wide screens
Update landing page panel titles again
Another round of wording updates to front page panels
Merge branch 'update_landing_page' into test

Conflicts:
	app/views/layouts/application.html.haml
	spec/fixtures/static_pages/.html