update tests for R.reset_category
updated template filter docs and tests
adding seconds, minutes, hourly metrics to templates
updating docstrings
updating HISTORY and roadmap
minor updates
utils._dates should return datetime objects using utc time instead of just date objects
refactor how _date_rage produces values
make sure always have a sensible start date
fixing tests
updated .get_metrics so it uses redis' mget
exlude metrics with missing data and default to the last 90 days as a time period
change the default time period from 90 to 7 days
updated the metrics_since tag to include links for 1, 7, 30, 60, and 90 days
minor template and css updates
checkboxes are better than multi-selects
changing the default date range again; a weeks worth of data makes sense, but a days worth makes more sense at the min/sec granularity
more tests