investigate bundle.js size

[lindsayplatt]

Currently, bundle.js is 1MB. Seems really large for what should be in there. Also, some of this is already minified but I was under the impression that since we are executing webpack --mode development it would not minify anything. bundle.js seems to have a minified version of every single node module, not just the ones we need. We should fix that. It is probably due to this: https://github.com/USGS-VIZLAB/gage-conditions/blob/master/js/app.js#L2. We should require only the modules we need. This goes along with #7 and #9.

http://dev-owi.usgs.gov/vizlab/gage-conditions/js/bundle.js