Bumping minimum version....

So... _"in order to compile (with 32-bit support), you need to set DEVELOPER_DIR to an Xcode 4.6 Developer directory and run build.sh. Xcode 5 cannot compile 32-bit kexts."_

Does this even work in Xcode 6 on Yosemite/Mavericks?
Is there any breaking changes that prevent 32bit from building in the yosCodeSign branch?

As discussed in #31 , this branch probably should be on master.
Maybe it is the time to bump up the minimum required version to the one that supports kexts signed with the latest xcode (10.7? 10.8? 10.9?) and maybe keep another branch that works on older versions.

@d235j @MaddTheSane thoughts?