fix compile issues resulting from https://github.com/jclouds/jclouds/pull/1511
Merge pull request #50 from jclouds/async-fixes

fix compile issues resulting from async scrub
adjust Mapped -> SyncToAsync
Merge pull request #52 from jclouds/async-nits

adjust Mapped -> SyncToAsync
removed async classes from rax dns and cleaned a few nits
Merge pull request #49 from jclouds/unasync-rax-dns

removed async classes from rax dns and cleaned a few nits