Added an 'int' template filter
adding  to_int_list and to_json filters
format data so it's easier to plot in Chart.js
including Chart.js, zepto.js, and some code to generate chart colors
replace google charts with Chart.js; tweaking some css, too
a few more tests
probably doesn't belong in this branch but... set gauges in addition to metrics when running the system_metric command
Use template tags to display charts for the metric detail and history views, see #14
Adding options to generate test metrics including the ability to randomize (or not), specify the number of days worth of metrics, and whether or not to cap values
renamed get_metric_history_as_rows to get_metric_history_chart_data
since that's what we're really doing; update the Aggregate Detail view
so it only passes data to the template, instead of pulling metrics.
replaced the logic from the aggregate detail view with the aggregate_detail template tag
move yellow to the back of the list of colors, and darken it a bit because it's difficul to see.
replacing aggregate history view data with template tag
update tests for views
updating tests for template tags
full coverage for utils
removign unused code
better test coverage
updating daily email so content makes sense
replaced gauges with Chart.js and adjusted template context for the gauge tag; updated tests

Close #21 and Close #14