responsiveness fixes for submit diea form and nav bar

Nav bar now doesn't have extra space above it for on small widths
Text fields in submit idea form use bootstrap span class for width
css files reorganization

renamed html 5 boiler plate css to h5bp_base.css
put all other css into style.css
css refactor, style schedule page, nav bar active tab fills whole height

created .box css class for drop shadowed box like on the ideas page.
create .blue and .darkblue classes for consistent text colors.
move schedule to index.html and remove placeholder text