Dashboard: Latest ng-google-chart.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Logger: Check if value is nan and create null, because json does not support nan.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Dashboard: Working history graphs.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>
Dashboard: Fixed login and some other issues.

Signed-off-by: matematik7 <domen.ipavec@z-v.si>