mysql: filtering through xz to compress on the fly

Now, the backup databases script implements xz to compress the dump on the fly; making it far smaller than before.

I should add a check for software packages. Maybe a helper would be nice...
mysql: check if xz and mysqldump are available
better permissions for controllers and actions
better bootstraping
Added Fedora 20 support
Installer script added
added generic helpers
3-level helpers

Now, helpers should be available in 3 levels: general, distro-specific and distro-version-specific
Merge branch 'Helpers' into Fedora
better bootstraping
Installer script added
Merge branch 'Fedora'