Add configuration options in app.js where needed

[webdevbrian]

There are a few areas that need to have configurable options (defined in app-config.js) that need to be added to the app.js file.

Places like this:

  setInterval("getWeather()", 900000);

Should probably have a configurable config option like "update weather interval", that the user can define in seconds, and we convert that to milliseconds.

See app-config.js to see how it is defined to set the configurable options. I'm open to seeing more parameters that the user can define through out the app, so be creative ... and think about usability a the user!