Replace clock with time

Clock seems to onyl be measuring cpu time, whereas what we really care about here is wall time
Add missing LICENSE document
Make last contact times fuzzy and relative to current timestamp
Update bootstrap-datetimepicker and moment.js
Cleanup logo and nav layout
Correct path to room image
Actually use room image
Fix usage of datetimepicker for new version and change datetime format to one that rrdtool actually understands

Includes fontawesome from bootstrap CDN
Restore info box on graph mouseover
Fix maths related to graph info hover-over
Instead of switching to a large graph image, provide logic to embiggen without changing url

This should provide a better user experience.
Shrink base font size and provide default styling for graph and info box
Don't append zero seconds onto end of datetime

It no longer makes any sense, we'd be appending to the date part!
Set default probe test colour to white

For higher (lighter) values it will still switch to black.
Add logic to embiggen graph on click
Correct path to icons
Correct regex for start and end timestamps to accept new format
Fix error handling logic

Checking that start is before end makes no sense with new datetime format,
instead catch errors from rrdtool and output something understandable.
Merge pull request #14 from jrha/updates

Updates