Change GDB -> LLDB for #15

Converted docs and tutorials on GDB -> LLDB using http://lldb.llvm.org/lldb-gdb.html and through testing on my MacBook Air running OS X Yosemite 10.10. I'm leaving in docs/gdb* as it might be useful in the future for reference. I also ran the markdown conversion to convert the md->html.

It should also be noted that the syntax to change to intel flavored x86 isn't as "pretty" in lldb; however, lldb allows you to set your own aliases in ~/.lldbinit similar to ~/.gdbinit. Therefore, when you're making the VM for Spring 2015, I'd recommend adding an ~/.lldbinit with `settings set target.x86-disassembly-flavor intel` in it.