Don't add bundle hash when in development (#192)
Don't add bundle hash when in development (#192)

Previously, webpack would add cache busting hash while in development.
This causes a lot of distinct bundles to accumulate in static/build.
Webpack then picks up on those *.js files and spends 2-3 minutes on
start up processing many large js files. By removing the bundle hash, we
can clear out static/build once, it won't fill back up, and webpack
won't work so hard.
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