fixes #3769 - added foreman-rake and debug man pages

This patch introduces new file Rakefile.dist which is then used in the SPEC
file to generate man pages. My plan is to refactor everything that make sense
from SPEC file into this new Rakefile.

The reason why separate Rakefile is because we do not want to boot whole Rails
stack during build.

This is much more flexible and gives us possibility to do things like:

* distribute project tarballs with assets precompiled and vendorized gems
* less patches in Debian packages
* be more close to the traditional software delivery in the open-source
  industry

Additionally, it fixes "Fedora" use in the description.