Added Piwik analytics integration
I'm curious to see how many people find this utility useful, so I added Piwik to track app usage. Sorry, privacy lovers.
BTW, my Piwik instance is hosted at ebaschiera.com, so if you want to block stats, block connections to that url.
In the meantime I will learn some more Android development stuff, and I will add a switch to turn off analytics in the app.