Merge pull request #55 from ross-p/master

Source install now works. Paths now configurable. Added init.d.
Fix support for os_family RedHat
Merge pull request #56 from rfairburn/master

Fix support for os_family RedHat
Use nginx_map.default_group for group in all places
Merge pull request #57 from rfairburn/master

Use nginx_map.default_group for group in all places
Allow selection of repo_version
Update pillar.example
Merge pull request #58 from OneID/feature/repo-version

Allow ppa install using development/mainline etc
Force overwrite of /etc/init.d/nginx
Merge pull request #59 from OneID/feature/upstart-symlink-checking

Force overwrite of /etc/init.d/nginx
nginx config default should use the error.fifo
Merge pull request #61 from rfairburn/master

nginx config default should use the error.fifo
Removed duplicate service enabling code.  "service -> enable: True" does this already, you don't need to explicitly call update-rc.d
Added optional ability to disable creation of /etc/nginx/sites-(available|enabled)
Moved use_upstart and use_sysvinit default values into map.jinja.  Source install now using default user/group names defined in map.jinja.  Moved more default definitions from source.sls into map.jinja.
Now restart nginx service instead of reload.  Reload, while nice on config updates, doesn't have the required effect when you upgrade nginx.  If we can reload on config update and restart on code upgrade, that would be great.  For now we just always restart.
Added 'silence_compiler' option which will cause all stdout from source build/install to be suppressed (logged to a file, in case you want to see it later).  stderr is also logged to file, but if there is an error then stderr is copied to Salt so it comes back with the highstate payload.