refactoring into callback function
simultaneous sensor rendering
correct div location + add 'fade'
add queue.js to index.html
implement standalone 'graph'

* fetch sensor values asynchronously and wait for all results
* create function to compute date which is 'hours' before the current
  time
draw multi-line graphs
refactor Configuration out to it's own object
simplify sensor view
cleanup test code
add queue.js to _attachments/js
updates to fermware-proxy

* update poll time to 60 seconds
* insert data retrieved as sensor data using Basic Auth (hardcoded for
  now)
* add preliminary config fetching for sensor mapping