push .etc under explore
rename home.html to start.html
show media and culture conditions from mario rather than DB

closes #13
add legends to cell_line & ligand pages

closes issue #10
made sibling browser use a grid for better small-screen usability
fixed sibling browser z-order issue on main page
Merge remote-tracking branch 'sorgerlab/gfb'
updated gitignore to ignore signaling/ instead of output/