Support for different units, fonts, and color

Adds support for:
  setting different units CA, SI, UK, US
  choosing different system fonts for use in the image
  setting a custom color rather than just black or white
Removed color option.

Supporting Forecast.io color arg seems silly as it only changes the temp range bars.
Removed color from url
fixed order of args in url
Merge pull request #3 from bob0the0mighty/master

Added a few options to geekWeather2.sh