v0.15.0-beta

This release is aimed at getting as many dependencies as possible up to date without significant refactoring.

• Refactoring: Tests prefer build, build_record over FactoryGirl.create where possible
• Refactoring: View tests minimize DB interaction greatly
• Refactoring: @user.check_if_needs_approval must be explicitly called in rake tasks or similar, it is no longer a User before_create hook
• Refactoring: @user.destroyable? must be called in rake tasks or similar, it is no longer a User before_destroy check
• Various gem updates
• Upgrade to Paperclip 5 (see https://github.com/thoughtbot/paperclip/wiki/Upgrade-Paperclip-4x-to-5x)
• Upgrade to paper_trail 6+ (https://github.com/airblade/paper_trail/blob/master/CHANGELOG.md)