android-build prefixes: staging- landing- tracking- <no prefix>

I've had a couple of questions about some new prefixes that are showing up on https://android-build.linaro.org.

Here's the breakdown:

staging-

LT board support patches + jstultz's common Android tree, this is a pretty stable point

landing-

LT board support patches on some version of the kernel

tracking-

LT board support patches + Linus HEAD + the Android tracking branch

<no prefix>

Only jstultz's common Android tree, the so-called upstreamed only support

These builds go into the LEB ranking system. This system gives the build a star value depending on what's working (Ethernet, Audio, etc..). If a build attains a certain star value it is called an LEB.

Feel free to catch me on this thread or on irc or mumble if you've got any comments or questions.