added heatmap legend and stats in dashboard
Merge branch 'master' of https://github.com/dzimine/collectd3
more visual tweeks - colors TBD
Merge branch 'refs/heads/master' into dev

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>

Conflicts:
	web/apps/dashboard.html
Add Dashboard Heatmap stat computation

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>
Change Tooltip to handle multiple lines of info

Signed-off-by: Kirill Enykeev <enykeev@gmail.com>