backends-switch: add colors

With css, a red dot for non-responding backends, a green one for
those which work
fix: remove print
backends-switch: add colors

With css, a red dot for non-responding backends, a green one for
those which work
fix: remove print
Merge branch 'feature-backends-switch-colors' of github.com:matthieucan/adagios into feature-backends-switch-colors
travis - Always install latest pynag
replace circles to use the same as in the hosts list
Merge pull request #367 from matthieucan/feature-backends-switch-colors

backends-switch: add colors
Exception handling around volatite userdata

This patch makes adagios a little more elegant
when there are problems getting the user-specific data.

Specifically, it will display a warning instead of a traceback
if userprefs is the only problem we are facing.

Additionally fix a problem where stylesheets were not correctly
loaded if user prefs had problem.

Fixes #366
Fix livestatus in FakeAdagiosEnvironment
Update tests for status_detail page

Issue #368
Fix traceback in /contact/details

Fixes #368
Fix URL to contact detail

Issue #368
Better testing for Service BI process
Retrigger travis tests