Adding meta information for role

I've added the meta details of upstream per their github page along with ubuntu
versions from the source tree.
Categories I've just sort of guessed.
Merge pull request #7 from goetzk/add-meta-to-repo

Adding meta information for role
First stage of converting upstreams role

The role (as provided by upstream) is basically an ansible repo which can be
used to do deployment rather then a role to add in to an existing repo.

This change moves everything in to in to the "right" place for a normal role
but I haven't sanity checked it by using it yet - very much a work in progress
still. I'll make some more changes so its as similar as possible to the output
of ansible-galaxy init.
Changes to readme due to changes in role structure

This is causing several changes:
* Removed requirement for ansible to be installed (its obvious)
* Removed "run ansible" step (its run differently as a 'pure' role)
* Changed example section to match heading in galaxy generated README
* Added license section though its still TBC
Add more headings to README

These headings match galaxy generated headings and might be useful as the role
is converted. I also changed "System Requirements for Target System" to
"Requirements" - it matches galaxy and is explanitory enough.
Delete ansible_hosts

This file only needs to exist at the top level, not in a role.
Merge branch 'roleify' of github.com:goetzk/netatalk-ansible into roleify