process isolation. Unpack archive into clean spool
code style
Merge pull request #98 from noxiouz/fix_clean_spool_in_process_isolation

process isolation. Unpack archive into clean spool
Keep the storage alive in Router group management.

When initializing or refreshing the routing groups, keep the storage reference
alive so that we won't re-initialize it for every group we got from the group
lists.
Don't cache routing groups as it's impossible to

update routing groups without cleaning cache by hands.
Get rid of group_t struct.
Merge branch 'noxiouz-disable_group_cache'
Drop unnecessary public typedef.
Message with verbosity 0 leads cocaine-runtime

to segfault as nullptr is sent to a stream.
Merge pull request #110 from noxiouz/fix_convert_verbosity_more_gently

Message with verbosity 0
Merge branch 'master' into docs