fix for issue546 - jslint errors in the code examples (getting-started-guide)

RE https://github.com/yahoo/mojito/issues/546

This pull requests fixes or at least sliences all the JSLint errors and warnings in examples/getting-started-guide.  The fixes for the developer-guide are stil TODO (https://github.com/dmitris/mojito/commit/d466d17e1d5e6cfa1cdd4f502782f2315aa9c53f is the first one)