Make configuring for cloud9 IDE easier

[etherealite]

Getting this awesome project working in Cloud9 IDE can be a little tedious. Finding all the configuration strings and changing the port numbers to be compatible with Cloud9 is a bit on the arduous side.

This PR allows one to set the port for the webpack dev server by defining a single variable at the top of the server.js file.

[andrzejkrzywda]

@etherealite thanks for the PR, it would be great to make it easier to run koans on Cloud9!

We'll just double-check if it works both on Cloud9 and locally and if so, it'll be merged.

[andrzejkrzywda]

After I tweaked it to run locally, it works.

I think the local version should be default, so maybe we need to apply this back:

-var host = 'react-koans-etherealite.c9users.io';
-var webpackPort = 8081;
+var host = 'localhost';
+var webpackPort = 9090;

and then add a README section explaining how to make it work on cloud9, then it would be best?

What's your opinion @etherealite? Can you help with this?

[etherealite]

@andrzejkrzywda I'm glad for the opportunity to give back a little.

I completely agree that this branch should be changed so that webpack will bind to localhost:9090 by default.

I have only one difference of opinion on your proposal. I do not think cloud 9 installation instructions should have their own section in the README.md, as the subject is incidental to the existing directions. How about putting a link in the README.md? It could read something like: 'how to install in cloud9' and then point to a GitHub wiki page that had the directions.

[andrzejkrzywda]

Good point with README vs GitHub wiki. Let's go for this.

[etherealite]

Are the ES6 template literals ok to use, or should I make it ES5 compatible?

[voter101]

Stuff from ES6 is fine, so template literals are OK to use.