List of Issues/Errors and fixes for Windows users (and possibly others)

I'm currently using Windows (ugh) which is a complete nightmare but, considering there are bound to be other folks using it, here's my experience with a fresh clone of master as well as some notes and references. I'll keep this post up to date with additional fixes and issues as they roll in.

**Current status:** es2015 preset must be installed and added to `.babelrc` to prevent `SyntaxError: Unexpected token import` and build.

Environment:
- Windows 10
- Node v6.10.3
- Tested with Git Bash (MingW) and CMD
- Make sure your gitconfig is set to check out with the correct line endings `git config --global core.autocrlf input`

Steps to Reproduce:

`git clone git@github.com:btholt/complete-intro-to-react.git`
`cd complete-intro-to-react`
`yarn install`
`yarn dev`

- **Error**
`NODE_ENV not recognized`
**Fix**
update dev script in to package.json to:
`"dev": "SET NODE_ENV=development && nodemon server.js",`

`yarn dev`
- **Error**
`SyntaxError: Unexpected token import`
It seems like webpack isn't honoring the "dev" prefix
**Fix**
To get this working in Windows, I had to add the babel es2015 preset:
`yarn add babel-preset-es2015 --dev`
and add the preset to my .babelrc:
```
"presets": [
"react",
"es2015",
["env", {
...
```

`yarn dev`

At this point the app builds and works correctly. A coworker was able to get this to build without the need to add that preset; I don't understand yet how that's possible. Without that preset, is it supposed to be using the "env" preset that loads the "transform-es2015-modules-commonjs" plugin? If that's the case, why wouldn't babel honor that configuration on my machine?

There's still an error here but it doesn't prevent the app from working.

- **Error**
In console: `TypeError: require.ensure is not a function`

**Fix**
None Yet :D (See #65)

Currently, I'm unable to complete a dev build in Windows from a fresh clone of master. Interested to hear whether any Windows users have gotten this to work.