- Create 3 new rpm-specs:
  * 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