Changed style of expired graphs that were not downloaded.

Makes it easier to distinguish between which graphs can be attempted
today, and which ones can only be downloaded.
Added sitemap to footer of each page.
Added sentence on download page explaining graph.

Specified the number of players that will compete on the graph, as well
as the number of seeds to choose (in plain English).
Changed to use RedisStore instead of MemoryStore.
Removed nav-list CSS class from team listing.

No longer exists in Bootstrap 3.
Replaced legend with non-SVG element.

This resolves all issues experienced of not seeing the scores when the
(inner) width of the window became too small.

Also made it so that a larger color scale is used when there are more
than 10 teams competing on the same graph at once.
Fixed issue with regular expression for submission.

Made sure that the lines starts with a number, but allows it to be
followed by any amount of whitespace in order to support '\r'.
Added support for graph descriptions.