Added KnC Wallet for Android

KnC Wallet builds upon the strong foundation provided by Andreas Schildbach's Bitcoin Wallet. On top of that we added an easy to use directory feature, which allows you to link your phone number and your wallet address together. This makes it possible to send bitcoins directly to the people in your contacts list, without having to worry about addresses or qr codes.

We believe in making bitcoin accessible for non-technical people and this wallet is a great first wallet for people wanting to try on bitcoin.

In the background, the app uses the well tested `bitcoinj` library and talks directly with the bitcoin network.

Please ask if you have any questions regarding the app, I should be able to answer anything about it, including highly technical questions.

Preview of the additions:
![KnC Wallet](https://cloud.githubusercontent.com/assets/189580/3778462/5aaedc0c-1973-11e4-9c45-1f7414ffb99c.png)