Readme tweaks

[macMikey]

• Add instructions for including the helper, including submoduling, ad modifying app.yml
• Fix typos
• Made the example a mouseup handler since it's an example.

[macMikey]

I don't have helpers specifically called out in app.yml for the heck of it. What the heck was the problem we ran into if we did just ./helpers? I can't remember what it was off the top, but the way to fix it was to specify the helpers individually, I thought. I have the preferences, logger, error handler, etc. all called out specifically because of whatever the issue was.

[trevordevore]

I don't recall a problem with just using ./helpers. preferences and logger are helpers that come with Levure. They require the [[FRAMEWORK]]/helpers/ syntax. You probably list them separately because you don't want to load all of the helpers that come with Levure. For the app it makes sense to just use ./helpers because any helper you place in there you intend on using in your app.

[macMikey]

Oh FRICK I realized that I had ```[[FRAMEWORK]] in the readme. #FALE

[macMikey]

Have a look at that.

[macMikey]

better?