make neoagent multi-process every environment
remove unused files
add neoctl

neoctl is the utility for controlling neoagent processes
add a thread for communicating neoctl

 * `reload $envname` reloads neoagent
 * `restart` is not implemented yet
add receiver mechanism for neoctl restart ${envname}
add neoctl command
add manpage for neoctl
add zsh completion for neoctl
resolve race condition for SigExit
make limit of process name length 512 -> 64
reumove unused pthread_cond_xxx
add ctl block
add doc for neoctl configuration
v0.7.0 released