Add chart functionality to show sensors values for the past hour

[Elleo]

I don't know if this is of interest, but I thought I'd share it in case you'd like this functionality upstream as well.

This pull request:

• Adds jQuery, moment and chart.js libraries
• Updates existing code to use jQuery for less verbose access to DOM elements
• Adds chart displays for each sensor. If you tap a sensor metric on the summary page the summary is hidden and a chart of that sensor's data for the past hour is displayed. Tapping again, anywhere on the screen, will return you to the summary page

A short video showing this functionality can be seen here: https://www.youtube.com/watch?v=AefVGVBTMG4

[9600]

Hi @Elleo, this looks great and many thanks for the PR, it's appreciated!

We'll review in due course with a view to merging.

[Elleo]

Great, thanks :)

[callumsnowden]

I've had this on test this morning and found no issues with it, it looks great!