add history to the show method on UsersController
swap policies list for contributions in the last week
get the latest 20 contributions not those from the last two weeks
tests for previous commits
Fix bug where we weren't limiting to last 20 changes
Indentation only
Extract method
Also order records coming out of the database so we get the latest
Merge pull request #976 from openaustralia/recent_contributions

Changes user page to show 'recent contributions' rather than 'policies create by'