Enable use on Mac OS X 10.8.x with new method signature and dummy implementations.

This patch is from: <https://github.com/pipt/lightblue-0.4/commit/601beb57991412bd8c864af59b0634be7be0e6d2>

I tested that it works with 10.8.2 and our current libpebble readme already states use with 10.8.3+ is required.

Without this patch 10.8.2 does not work either. This suggests that all versions of 10.8 might require the patch and given we only explicitly support 10.8 then I think we should just pull the patch into our master. (This would also mean we don't need to redirect people to <https://github.com/pipt/lightblue-0.4/>.)

Related issues/patches:

 * <https://github.com/postskolkovo/lightblue-0.4/issues/2>

 * <https://github.com/postskolkovo/lightblue-0.4/pull/3>

 * <https://github.com/postskolkovo/lightblue-0.4/issues/4>
Merge pull request #8 from pebble/fix-10.8-support

Enable use on Mac OS X 10.8.x with new method signature & dummy implementations.