Don't upload npm/bower directories during CloudFoundry release
Don't upload npm/bower directories during CloudFoundry release

Since CloudFoundry push isn't tied to the list of files tracked by
git it will add pyc file, venv, node_modules and bower_components
to the release archive. They're not required, since we're running
the frontend build locally anyway and nothing is loaded from
bower_components on runtime.

Adding them to .cfignore reduces the size of the release from
49MB to 5MB.

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