Update plpaste to use permissions instead of adminonly

Change adminonly=True to permissions=["adminonly"] in plpaste
Remove duplicate code in topic()
Merge pull request #241 from MorrisJobke/remove-duplication

Remove duplicate code in topic()
Merge pull request #226 from daboross/patch-4

Update plpaste to use permissions instead of adminonly
Merge branch 'develop' of https://github.com/ClouDev/CloudBot