[PR] Fix comparison graphs

[solderq35]

The comparison graphs didn't display correctly before, now they do.

Fixed background colors on comparison map popup, and slanted background pictures for the building comparison pages

[solderq35]

http://localhost:8080/#/compare/%5B%2228%22,%223%22%5D/2

[solderq35]

http://energy-dashboard.s3-website-us-west-2.amazonaws.com/#/compare/%5B%222%22,%2216%22%5D/2

[solderq35]

used page ruler extension and increased width of the background image segments to cover gaps

[solderq35]

There is still a console warning if you compare a building that has non-electricity data (e.g. solar or gas) to an electricity only building, and then refresh the "view full graph" page

Actually, the comparison only works for Electricity; if you try to include any building without Electricity in the comparison it will error out.

That probably should be handled with some user friendly error at some point

[solderq35]

couldn't be bothered to properly display a warning for comparisons between incompatible buildings, but displayed info about how only electricity is valid on initial comparison prompt