Accept patches from Jörg Richter which fix a bug and implement
a todo item in the small allocator, and change slab_alloc_minimal to
16, to work well out of the box with small tuples.

Add missing comma to iproto_constants.c.

Required for #194

A fix and a test case for gh-791: call() return value can't contain
a Lua map.

Treat a map as a scalar, i.e. convert it to a tuple field on return
from call.

Use a simple heuristics to distinguish a map from an array:
if the first key of the map is integer 1, it's an array.
This approach works pretty well for JSON maps, which can't have
non-string keys anyway.

If failed to set locale to C.UTF-8 (the standard one which supports UTF-8),
try other options. Keep trying ad naeuseam to silence the warning,
since this raises support questions.

CentOS 6.6 has en_US.utf8.
Debian, FreeBSD and Darwin have en_US.utf-8.

Provide a good memory footprint out of the box.

fix typo at box-protocol description

Fix a crash due to memory corruption in fio.dirname().
A test case would test nothing since the corrupted Lua heap
doesn't crash on you immediately..

fio.dirname() is tested in fio.test.lua

Setting password for user guest has no effect, add a check
that prohibits setting a password for a user just like it does
laready for a role.

Add a test case.