Remove connector/python and connector/ruby since
these drivers are hosted separately now.
https://github.com/mailru/tarantool-python
https://github.com/mailru/tarantool-ruby

A fix and a test case for Bug#901674
"No way to inspect exceptions from Box in Lua"

Implenent pcall which works correctly with Objective C
exceptions.

SHOW INFO now prints path to config
Review Dmitry's patch, fix tests.

Incorporate spelling/grammar mistakes identified during
a review of the user guide, done by courtesy of Peter Gulutzan.

Start extending the manual with Lua stored programs.

Update ER_NO_SUCH_PROC, if the procedure doesn't exist,
quote the procedure name, since it can be empty.

A fix and a test case for
https://bugs.launchpad.net/tarantool/+bug/750658

--background neither closes nor redirects stdin/stdout/stderr

--background option didn't work properly, since stdin/stdout/
stderr streams were left open and pointing to a terminal.

This lead to a hang when tarantool was started from a
shell script or over ssh.

If --background option is given, we need to fork,
try to create a pid file, close stdin/stdout/stderr
and then initialize the logging
subsystem.