Moved history filter out into historyfilter.js; made visitsInLastNDays generic.
Added rough popup that graph's the last week's visits to the site. Currently appends an svg, which is unncessary.
Added id to svg so that graph.setUpContainer() finds it and doesn't have to append a new one.
Removed unnecessary script reference.
Get placeholders in for array of daily visits so that if there's only one visit in the last seven days it doesn't show up as a gigantic bar in the graph.
Set colors on bars in graph.