Move dependecies section down to installation part
Fix CSS loading

No need for loading bootstrap-default anymore
Warn if nodes haven't reported in more than X hours

Defaults to 2 hours, but configurable with the option
UNRESPONSIVE_HOURS.

Fixes #11
Fix unresponsive warning when the configuration is missing
Fix failure and changed sign for nodes that have no report status

If the node was reported using a old puppetdb-terminus it might be
missing the report status. This shows it as failed anyway if it has
failed events and changed if it has changes.
Use the demo site puppetdb instance by default for development