This patch implements beforenm/afternm calls from NaCl for `box` style
crypto. It's main advantage is way faster computations, since it avoids
recomputing in the elliptic curve for every message.
While here, bump the version to v0.11.0 as new functionality was added.
This is not like the `crypto` subsystem, where a runner is needed to keep the
crypto system up and running. Rather, we can run without an application runner.
