added --drop-after-init and --drop-after-apps
added --pivot-root (linux only)
--pivot_root and --pivot-root
Adding **kwargs to @harakiri

I can't see any reason why this decorator doesn't have `**kwargs`, so I add it.
Merge pull request #373 from ivanjr0/master

Adding **kwargs to @harakiri
added --disable-sendfile
Merge branch 'master' of github.com:unbit/uwsgi
added support for O_TMPFILE
some garbage...
added FreeBSD jail support
improved support for FreeBSD jails
do not call pre-jail on reload
added --jail-attach
remount to private subtree after unshare

systemd will makes the VFS tree 'shared' on boot, so mount
operations would propagate between the namespace and the
parent system.
make sure the whole VFS tree is private to the namespace.
Merge pull request #374 from gdamjan/master

remount to private subtree after unshare
prepare for advanced hooks
first public implementation of the advanced hook subsystem
added callint/callret hooks
added log encoders
added msgpack plugin, it misses int and float support