Added templatePath and compiledTemplatesFile Server.options

Defaults to paths outlined in Rendr readme with Server.options overriding them.  I've updated the tests

---

Everything is relative to entryPath and it also resolves paths.

```
{ 
entryPath: '/my_app/'
templatePath: '/app/views/'
compiledTemplates: '../tmp/compiled_templates.js'
}
```

In order for this to work, I had to pull out the hardcoded template path within rendr-handlebars:index.js:27

```
localExports.templatePatterns.push({pattern: /.+/, src: options.entryPath + 'app/templates/compiledTemplates'})
```

I have a fork of rendr-handlebars that makes that an option.  I can send you a pull request of that as well.


The one thing that I'd like to see is a configuration of "__layout".  My thinking here is that it should somehow be incorporated into App & Views.  So you can say this App uses __layoutX, but these five views can override with  __layoutG.