Add admin column to users table
Set admin default to false
Update fixtures
Add admin tests

Require users to be an admin to
* Get new
* Create post
* Get edit
* Update post
* Destroy post
Merge branch 'feature/admin-permissions' into develop
Hide admin links to non-admins:
Require new post to have a user id
Merge branch 'hotfix/post-user'
Merge branch 'hotfix/post-user' into develop
Hide statistic about news posts when user is not an admin
Update version number and update CHANGELOG
Merge branch 'release/1.0.0'