Missed serializing a get_connections RPC response parameter
Changed time_t to uint64_t for serialization

time_t is implementation-, architecture-, and apparently
compiler-dependent.  As an example, on my machine if I build a 64-bit
binary, sizeof(time_t) is 8, but for a 32-bit binary it's 4.  uint64_t
is therefore much more consistent for serialization, given that RPC
calls are potentially made between different machines.
Merge pull request #68 from tewinget/daemon_rpc

daemon rpc get_connections call minor changes