Conflicts:
	doc/user/connectors.xml

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

Nullify risky os.*  methods, as well as 'require', to prevent load
of potentially risky dynamic libraries (.so).

Add a small test.

The run test script was updated.

Delete and update_fields methods was fixed. Tests was updated.

64-bit fields support was added.
The call test was updated.

Error test from server's responce was added to exceptions.

The function raise_exception was deleted, for exception the function
zend_throw_exception_ex is using.
Now send/recv functions is a part of I/O buffer interface.
Functions read_*_io_buf was moved to io_buf_*.

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.