A new way to install Tarantool on Linux:

    snap install tarantool --channel=edge

See http://snapcraft.io for details.

Closes #1714

Fixes #1602

Move coverage scripts to tarantool/build

* Use DEB_CMAKE_EXTRA_ARGS instead of DEB_CMAKE_NORMAL_ARGS
* Fix double invocation of cmake . during building package
* Fix multilib on old version of cmake (Ubuntu precise)
* Fix man page generation

Use values generated by cmake. Needed for homebrew.

This patch also enables daemon supervision when used with systemd.
A prerequisite for Fedora/EPEL7 packages.

* Add -DENABLE_DIST=ON option to enable init scripts on `make install`
* Create directories for tarantoolctl on `make install`
* Add logrotate script to `make install`
* Fix example.lua to work out of the box
* Use /etc/default instead of /etc/sysconfig on Debian
* Fix directories permissions for tarantoolctl
* Add support for systemd-tmpfiles (required by Fedora)

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)