navigation drawer

As discussed on the forum, I have gone ahead and made a navigation drawer which switches between activities rather than going through and making fragments out of everything. Hopefully we can get to the fragmentization for 2.3, but it's not strictly necessary.

I've tested that it *works* on the emulator with 7" and 10" tablets, as well as on my actual device, but there are almost definitely bugs remaining, and ways to make it work and look better, so please feel free to submit or suggest any improvements!

Obviously a huge acknowledgement is due to @agruenberg who did all of the hard work in bringing in the support libraries, etc.

![untitled](https://cloud.githubusercontent.com/assets/2818274/3197912/f86c69fe-ed50-11e3-8099-b3c09e08ec2b.png)

Fixed it in #375