Air Quality Egg Helper

Adds useful info to Air Quality Egg page on XivelyThis extension offers several minor tweaks to the standard Air Quality Egg page provided by Xively:

This extension offers several minor tweaks to the standard Air Quality Egg page provided by Xively:

* add units to measurements
* show the temperature in Fahrenheit
* show the last update time in local time rather than UTC
* show the last update time relatively ("Last Updated 1 minute ago")
* show a link to the raw feed for this egg
* add a favicon to the page (currently the favicon link is 404)
* automatically refresh the page (default 5 minutes)
* put the egg's name in the page title
* display additional sensors
* by default only display VOC, O3 and NO2 additional sensors

These tweaks can all be controlled via an options page.

Displaying additional sensors no longer requires a Xively account or login.

Source is available on Github at https://github.com/romkey/AirQualityEggHelper