Investigate Build RAM Issues

[rajadain]

Often times, running beekeepers build after starting the VM results in out of memory errors. This is observed both on local developer machines and on CI for PR builds. The disparity between webpack's build and dev-server behavior has been talked about elsewhere, e.g. webpack/webpack#6389 and https://blog.box.com/blog/how-we-improved-webpack-build-performance-95.

Figure out what is causing the excessive RAM usage, and address the issue.

Another fix may be to increase the RAM for the app VM.
Another fix may be to add a swapfile with https://github.com/azavea/ansible-swapfile.