Require.js instruction in readme

[daniel-nelson]

When following the example in the Compatibility with Require.js section of the readme:

require ['jasmine.waitsfor.requirejs'], jasmine.getEnv().execute 

I was running into an error in which this was window in jasmine.js:

jasmine.Env.prototype.execute = function() {
  this.currentRunner_.execute();
};

Fixed by:

require ['file_to_require'], ->
  jasmine.getEnv().execute()

It might be helpful to others to update the readme.