Added browser/node build distribution files. Build file using grunt.js

Woodman is different for browsers and servers, mostly because the
appenders won't be the same (the code is the same otherwise).

3 versions get distributed:
- dist/woodman-browser.js: standalone version that runs in browsers
- dist/woodman-browser-amd.js: version that runs in browsers provided
 the app uses an AMD loader
- dist/woodman-node.js: node.js package.

The "examples" folder contains usage examples for each version as well
as examples that show how to reference the source code of Woodman
directly (to ease debugging when authoring Appenders or Layout)