Add operations with crashlogs

Now avalaible:
    cocaine-tool crashlog:list -n app_name
    cocaine-tool crashlog:view -n app_name -m timestamp
    cocaine-tool crashlog:remove -n app_name -m timestamp
    cocaine-tool crashlog:removeall -n app_name
Service release 0.10.4-1.

Cocaine Tool support for crashlogs.
Set nonblocking mode on the right socket.

After a new connection has been accepeted, mark this new socket as
non-blocking, instead of remarking the listening socket once again.
Service release 0.10.4-2.

Socket non-blocking mode bugfix.
Merge branch 'v0.10'