Tidying up a bit

[hdgarrood]

• Consolidate the client and server READMEs into one file
• Fix local development instructions in README
• Remove some leftover backend stuff
• Update the license year
• Update the default main gist ID to one which uses gist.github.com/:gist-id urls, as expected by Allow gist navigation #140, so that the links work
• Update "help" link to point to main repo readme, rather than gh-pages branch

[hdgarrood]

cc @thomashoneyman @gabejohnson if either of you have time and would like to take a look at this?

[kritzcreek]

I think in the context of a compilation service a "compiler error" would still be a success either way. So making it easier to do CORS is nice, but I wouldn't need that motivation here.

[thomashoneyman]

We should probably include the default for each of these, ie.

Control the view mode using the `view` parameter.

- Options are: `code` | `output` | `both`
- Default is: `both`
- Example: `view=output` will only display the output

You could judge this for yourself by loading up the default Try PureScript page, but if you're say crafting a query string based off of this section in the readme it would be useful to see which options you can skip.

[thomashoneyman]

I have a few comments (the suggestions can be applied automatically), but they aren't strictly necessary and this otherwise looks good to me.

[hdgarrood]

Thanks! I'm going to go ahead and merge this now just to keep things moving but please feel free to comment/open PRs if you have further suggestions.