Move third_party library compilation to the top level (less
directory traversal).
Provide an option for using system LibEIO/libobjc.

Enforce a naming convention for cmake/ scripts
(Find* and Build*).

Move ev and eio wrappers to third-party (todo: delete
them completely).

There is one (known) problem with this patch:
tarantool --version now prints incorrect compile flags.
To be fixed in a separate patch.

Since connect/disconnect events in iproto run outside
fiber context, queue execution of on_connect/on_disconnect
triggers through the request queue. Generalize the request
queue for that purpose.

Implement a framework for on_connect/on_disconnect triggers
and Lua bindings for it.

Add tests and docs.

Move Box API declarations to box.h.
Make box.h a public header.
Add comments to box functions.
Rename fuctions accordingly.
Make includes for connector/c more local.

Reviewed-by: Konstantin Osipov <kostja@tarantool.org>

Change sio_advance_iov to never modify iov vector in place.
This allows for reuse of this function in a raw event
loop, without fibers.

Minor cleanups.

Make memcached/noreply.test less race prone:
flush all command is running in the event loop, and sometimes
it doesn't get a chance to finish before we issue the next
command.

 * join fiber->ready and fiber->ifc into one fiber->state
 * create fiber_yield_timeout function
 * channel uses fiber_yield_timeout
 * ipc test doesn't use fiber.sleep

Move memcached to src/
Make iproto.m dependend on box/*, not vice versa.
Remove box_ prefixes from test suite names.
Initialize networking outside of box/.

This makes Box a step closer to being just a storage
layer for Tarantool.

Still some ugly deps since box/ continues to manage
local hot standby and memcached expire (todo: move it out).

drop some ev_watchers from fiber structure.

all functions use rlist: avoid spare foreaches

Move mod/box/ src/box. Fix broken packages.
Rename tarantool_cpack.cmake to cpack.cmake.