Add references to node-resolve for options documentation (#82)

*  Adds `basedir` to documented options
*  Sorts options section alphabetically
*  Add references to node-resolve options

Author: marionebl

README.md

@@ -10,16 +10,21 @@ Resolve a module path and call `cb(err, path [, pkg])`
 
 Options:
 
+* `basedir` - directory to begin resolving from
+* `browser` - the 'browser' property to use from package.json (defaults to 'browser')
 * `filename` - the calling filename where the `require()` call originated (in the source)
-* `paths` - `require.paths` array to use if nothing is found on the normal `node_modules` recursive walk
-* `packageFilter` - transform the parsed `package.json` contents before looking at the `main` field
 * `modules` - object with module id/name -> path mappings to consult before doing manual resolution (use to provide core modules)
-* `browser` - the 'browser' property to use from package.json (defaults to 'browser')
+* `packageFilter` - transform the parsed `package.json` contents before looking at the `main` field
+* `paths` - `require.paths` array to use if nothing is found on the normal `node_modules` recursive walk
+
+Options supported by [node-resolve](https://github.com/substack/node-resolve#resolveid-opts-cb) can be used.
 
 ### resolve.sync(id, opts={})
 
 Same as the async resolve, just uses sync methods.
 
+Options supported by [node-resolve](https://github.com/substack/node-resolve#resolvesyncid-opts) `sync` can be used.
+
 ## basic usage
 
 you can resolve files like `require.resolve()`: