rename chart.js to StackedAreaChart.js
add CumulativeLineChart.js
set interval when creating chart
use interactive guideline in CulmulativeLineChart
increase polling rate to 5s
remove unused arguments
add toggleFreeze to StackedAreaChart.js
remove CulmulativeLineChart [cannot autoupdate]
add freeze button
add timespan to StackedAreaChart
add timespan radio buttons
add timestam parameter to stats methods/helpers
remove uneccessary form tag
migrate freeze button to checkbox
use true for radio checked argument
disable transition, as it looks weird mostly