Initial build.js invokes RECESS, GSS compilers

- Includes a simple application main.less file.
- TODO: Make a separate lint.js (since build.js does not run RECESS lint
checks).
- TODO: Next, break out separate project-config.js file.
- Adds Bootstrap 3.0.0 to 3p/
- Adds jQuery 2.0.3 to 3p/