Use the encryption info for 64-bits goodies available in the 10.9 SDK
Merge pull request #41 from 0xced/sdk-10.9

Use the encryption info for 64-bits goodies available in the 10.9 SDK
Fix invalid section offsets

Hopper v3 (http://www.hopperapp.com) has invalid section offsets in order to trick reverse engineering tools such as class-dump. Since dyld doesn't actually read those section offsets when loading binaries, it's safe to compute them and fix them.