Update README and add libcppa as dependency.
Update README and add libcppa as dependency.

Closes #15.

mavam/vast,pmos69/vast,vast-io/vast,mavam/vast,vast-io/vast,mavam/vast,vast-io/vast,pmos69/vast,vast-io/vast,pmos69/vast,pmos69/vast,vast-io/vast,mavam/vast