+ fix bsdsocket test

 * Move source files to appropriate location
 * Remove C wrapper for isysconnect/sysbind/sendto and
 * other functions
 * Remove box.socket.errno()
 * Change sockets to be non-blocked by
 * default
 * Code style fixes
 * Other minor changes

purpose: OOS-build tests fail

 * Install *.lua modules into ${DATADIR}/tarantool/1.5
    and *.so modules into ${LIBDIR}/tarantool/1.5
 * Fix default package.path and package.cpath
 * Install Lua headers to ${INCLUDE_DIR}/tarantool/1.5
 * Install config.h to ${INCLUDE_DIR}/tarantool/1.5
 * Add a new package - tarantool-dev (server development headers)
 * Use RPM Macroses in rpm.spec
 * Fix tarball generation for Debian
 * Use GNUInstallDirs.cmake to setup directories

 + memory leak in box.net.box (timeouted responses)
 + remote:ping() never throw exception

Closes #161

move module related tests from test/box/ to test/module/.

Summary:
* PLUGIN_DIR -> MODULE_DIR
* MODULE_DIR prefix is /usr/lib/tarantool/VERSION
* MODULE_DIR automatically appends to both lua c/path
* removed plugin autoload facility in src/lua/init.cc
* removed admin console plugin dependencies
* moved src/box/lua/sql.lua to separate module = require('box.net.sql')
* moved src/plugin/pg = require('box.net.pg')
* moved src/plugin/mysql = require('box.net.mysql')
* default .so and .lua install is lib/tarantool/modules/{box/net/}
* debian spec and tests are updated

Remove fiob_open_flags, use "mode" consistently.

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.

+ use luaL_ref/luaL_unref to store lua scalar instead lua metatable.
+ add :is_closed method.

fixes, follows from discussion https://github.com/tarantool/tarantool/issues/79#issuecomment-29309533

This patch implements show index and shows memory waste of the
slab allocator.

This patch also reworks title() to show role@custom_proc_title for all roles
as defined in the documentation.