Add ability to share high scores

Suggest submit and view high-scores as an option. Listing the highest score today, this week etc would add an element of competition. Sharing scores to Ubuntu Touch G+ or Facebook pages would be another interesting thought. Community features increase appeal and this could form part of a framework that other games on Touch can capitalise on...of course is an invitation for people to hack the system but could prove a learning point on UbuTouch security.