Implement basic support for stored functions in C/C++.

- split away struct func from struct func_def (function
object and function definition object).
- extend box.schema.func.create() to accept 'language' argument.
- move module API related cmake magic to its own file
- add test/lib to gitignore
- update to the new test-run
- add a test

This patch adds `src/module.h` header file with definition of all public
API functions suitable to use in Lua/C modules for Tarantool. This header
is automatically generated from src/*.h by CMake (`make generate_module_api`)
by extracting code blocks between /** \cond public */ /* \endcond public */
Doxygen-style comments.

Definitions of functions in module.h are frozen and must not be changed by
future commits/releases. A new test case `app/module_api` is added to check
compilation, linkage and loading of Lua modules and functionality of
provided API functions.

Other changes:

 * Convert mysql and pg to use module.h and prepare to convert to .c
 * Fix includes in say.h, coeio.h
 * Rename luaL_pushnumber64 to luaL_pushuint64 and
          luaL_pushinumber64 to luaL_pushint64
 * Add LUA_API macros to public luaL_* functions (actually adds extern "C")

Minor changes in cmake code style

* Move our site from our own Jinja2+Markdown to Pelican
* Move all pages from Markdown to RST(-highlightJS,+Pygmentize)
* Create plugin for documentation building (HTML for DocBook based and RST for hand-written texts)
  - Supports HTML for DocBook-generated documentation
  - Supports RST for HandWrittend Texts
  - Embedding into Pre-Based Templates
  - Using BeautifulSoup library for generating proper titles
* Adding Header to all site pages (e.g. Documentation)
* Modifications of CSS (we need to bring order to our CSS's)
* Modifications for DocBook xslt files and generations
* Add GitHub Ribbon
* Move FAQ to Documentation
* Documentation page is static now
* rocks.tarantool.org now in header

* tarantool_ctl -> tarantool_ctl
* Add test-run on travis-ci (closes gh-221)
* Proper fiber name in the log

* In RPM/DEB we introduce new utility - tarantool_ctl (extra/dist/dist.lua)
* /var/pid -> /var/run
* Fix extra/dist/dist.lua
* /extra/dist/tarantool.init and /extra/dist/tarantool.service now
  are regenerated by cmake (paths to `dist.lua`)
* Systemd service (Uses sysv-init script)
* RPM Supports both systemd and init (by using '--with systemd' in
  rpmbuild flags)

  * extra/rpm/tarantool-scl.rpm.spec - SCL spec for 1.5
  * extra/rpm/tarantool-el.rpm.spec.in - Enetrprise Linux 5/6 Specification
  * extra/rpm/tarantool.rpm.spec.in - Specification for other Linuxs
- Build (tarantool-el.rpm.spec and tarantool.rpm.spec) with `--define 'scl 15'`for SCL build.
- Preserve old spec (for compatibility)
- Add dependencies into Specifications, two specs for Mock.
- Create configuration files for Mock builds for EL-{5,6}-{i386,x86_64}

  Working with Mock:
    cmake .
    make new_rpm{_el,}_src
    mock -r <config> --init
    mock -r <config> --rebuild <path_to_srpm>

  Merging commits

Bring source package and revision control ignore files up to
date with the state of the master branch.

Update mans, docs.

A lot of resources still need to be updated (build scripts, etc).

Check that tuple is an msgpack array.

Move towards a uniform include scheme where header files are
stored along with the sources files, in the same directory.

We had to begin to use this scheme thanks to use of subprojects,
and a mix of two approaches turns the code base into a mess.

Add unit tests.

Remove trailing spaces. Get rid of an unused method.

2. Refactor find_tests code
3. Rewrite and Add comment for chdir(base) (test_run.py:145)
4. Rewrite .gitignore file for new name of unit tests

Rename tarantool_pthread.h to tt_pthread.h

This is a pre-requisite for addition of Perl stored procedures.

Don't load corrupted tuples.

The patch which removes the CPack-generated spec
and adds a proper spec for client, server and library
was done by Dmitry Simonenko.

Hand-port the patch to the master, since it's gone too
far away from the origin and merging it ends up in a mess.

- write the docs
- remove unnecessary introduction of Perl
- properly implement, document and test box.fiber.wrap()
- rename box.find, explore alternatives (none)
- rewrite box.unpack('R') to reuse code and do
what's expected of it.

autogenerate version file which can be used
in case when there is no .git repository available within sources and
it is crucial to properly display current version.

https://bugs.launchpad.net/tarantool/+bug/1131108