Correctly require() controller path

path.join() strips leading ./ which is necessary for referencing files by relative path.

Join dir and controllerName manually.
Use relative controller path in router example

Use a relative path in the router example rather than complete OSX path, which my previous commit enables.

*waves to OSX user jwhitlock* ;)
Merge pull request #12 from DotLinker/master

Correctly require() controller path