Updated for CoffeeScript 1.7.1. Updated meta/build files. Use DocPad plugins where appicable.

@timaschew can you review this?

Browserifying of `browser.js` is failing for some reason with:

```
Error: Browserify failed on: /Users/balupton/Projects/js2coffee/src/documents/lib/browser.js.eco
Parsing file /Users/balupton/Projects/js2coffee/out/lib/browser.js: Line 1: Comprehension Error
  at parseDeps (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/module-deps/index.js:249:45)
  at done (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/module-deps/index.js:229:13)
  at ap (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/module-deps/index.js:202:42)
  at /Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/module-deps/index.js:222:21
  at ConcatStream.<anonymous> (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/concat-stream/index.js:32:43)
  at ConcatStream.EventEmitter.emit (events.js:92:17)
  at finishMaybe (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:450:14)
  at afterWrite (/Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:330:3)
  at /Users/balupton/Projects/js2coffee/node_modules/docpad-plugin-browserifydocs/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:317:9
  at process._tickDomainCallback (node.js:459:13)
```