Correctly display UTF-8 characters
Add titles to plot and preview
Ensure the plot or preview are visible, not their containers
More results table to new inner div preview
Move function end brackets to new line for clarity
Update gitignore for Sphinx docs
Also ignore data points with value -1

This is a bit trickier, since temperature can be -1
However, this is fairly rare, it is more likely that a station has 2
detectors.
So values of -1 are now filtered the same way as -999
Warnings have been added to the functions with the filters
Add docs for jSparc

Add step-by-step guide for the data retrieval web app
Makefile for gh-pages
Add link to the data retrieval tool in docs