This patch replaces box.tuple userdata with similar cdata.

Allow start of tarnatool_box in #! form.

Remove script_dir.

Make all configuration options optional (primary_port
was the last one required).
Make the configuration file itself optional.

If no watcher is started for the event loop, either based on
the config file settings, or in the #! script, do not start the event loop.

Update the test runner to take the new changes into account.

Fix a bug in symbols_load() when no symbols
could be loaded when path to executable was neither
relative nor absolute (but based on PATH).

Fix a bug with ignored return value of slab_arena_create()
in tuple.cc

This patch add specialized versions of box.process for select, insert,
replace, update and delete requests. This optimization reduces the
number of Lua <-> C switches during request processing. New functions
create struct request directly without allocating temporary buffer for
entire request body.

Conflicts:
	src/box/box_lua.cc

This is a NULL-merge.

there are no --append parameter in OSX tee cmd, only -a

by https://github.com/tarantool/tarantool/wiki/Lua-API-1.6-%28ru%29#wiki-select

Conflicts:
	CMakeLists.txt
	doc/user/stored-procedures.xml
	doc/user/tutorial.xml
	extra/rpm.spec.in
	src/salloc.cc
	test/big/suite.ini
	test/box/admin.result
	test/box/configuration.result
	test/box/lua.result
	test/memcached/off.result

Rationale:
Any error which implies a system administrator action needs to be
marked explicitly in the log, so that it's easy to find and act
upon.

This change the number of log levels, so the default log level was
bumped from 4 to 5. Installations which set the log level
explicitly need to adjust their setting.

Switch the parser to use msgpack for request body.
Update the python driver and tests.

net.box.test is disabled.

Use object-oriented counterparts instead.

Split lua.test.py into a few smaller tests. Remove box.select().
Rename a few tests to follow the common scheme (feature = test name).

closes #171