fix build process in webpack

[chreman]

I was encountering build errors like

ERROR in ./node_modules/mediator-js/index.js 1:17-24
Module not found: Error: Can't resolve 'process/browser' in '~/Headstart/node_modules/mediator-js'
resolve 'process/browser' in '~/Headstart/node_modules/mediator-js'
  Parsed request is a module
  using description file: ~/Headstart/node_modules/mediator-js/package.json (relative path: .)
    Field 'browser' doesn't contain a valid alias configuration
    resolve as module
      ~/Headstart/node_modules/mediator-js/node_modules doesn't exist or is not a directory
      ~/Headstart/node_modules/node_modules doesn't exist or is not a directory
      looking for modules in ~/Headstart/node_modules
        ~/Headstart/node_modules/process doesn't exist
      ~/node_modules doesn't exist or is not a directory

which I was able to fix by a few webpack changes