Added my boot fixes.
Upgraded everything to Xcode 5.1.
Minor improvement to the xnu build procedure.

Now, all output (stdout and stderr) is redirected to the build log file. This results in a less noisy build as well as improvements to error tracing (as errors are now displayed in context, instead of separately from the normal messages that surround them).
Typo fix.
Fixed compile-time errors.
Removed erroneous README text.