fix typos and remove unused declaration
Merge pull request #92 from dwrensha/typo

fix typos and remove unused declaration
fix help message in capnpc-c++
Merge pull request #93 from dwrensha/help-message

fix help message in capnpc-c++
Close #94: obsolete comment in rpc.capnp
Merge pull request #95 from kaos/patch-2

Close #94: obsolete comment in rpc.capnp