Updated Enyo framework to 2.4.0-pre.2
Added splashscreen / back button functionality to Enyo

Previously, the Enyo implementations were not listening to the back button
events and would not close the splashscreen on iOS devices.

Fixes #203
Updated CSS rules for toolbar in Enyo
Improved look of app in Enyo

+ Reduced height of list items
+ Prevented image from being stretched
+ Simplified some CSS rules
Fixes "Load more..." button in Enyo

Button was not being displayed previously.
Updated enyo package configuration
Merge pull request #271 from matthewdunsdon/enyo-iu-improvement

Enyo UI improvements