Maid 365 fix drive tests

Tests pass in linux, mac, and windows. This [pull request](https://github.com/maidsafe/MaidSafe-Encrypt/pull/19) is needed to reliably pass the 256MB write test. Additionally, [a visual studio bug](https://connect.microsoft.com/VisualStudio/feedback/details/811192/std-call-once-hangs) seems to affect [this line of code](https://github.com/maidsafe/MaidSafe/blob/next/src/third_party_libs/cryptopp/cpu.cpp#L162), which can cause the remount test to hang indefinitely. I verified all threads thoroughly - they don't appear to be waiting on anything _but_ the call_once call.