1.7.2 support

First attempt at making the bot work with 1.7.2. Wouldn't launch when I did my quick test. Got this error:
```log
Exception in thread "main" java.lang.NoClassDefFoundError: bje (wrong name: net/minecraft/client/entity/EntityClientPlayerMP
```

Got pretty confused with all the refactoring Mojang has done, so it might be totally wrong in some places.

I don't have time to go through it. I am off to bed.