Initial implementation of Pundit authorization adapter
Refactored implementation of Pundit authorization adapter
Added info about Pundit support into documentation
Update 0-installation.md

I think it's better to state it (I did spend some time on this :( )
Merge pull request #3004 from francescor/patch-1

Update 0-installation.md
Merge pull request #2857 from romansklenar/feature/WIP-add-pundit-adapter

Pundit authorization adapter
Hold back sprockets, ref: #3005