Qualify WorkPackage order scope with table name

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Replace AR conditions w/where in acts_as_watchable

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Correct methods defined by TabularFormBuilder

`ActionView::Helpers::FormBuilder.field_helpers` is now an Array of
symbols.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Handle ActionController::ParameterMissing in APIv2

This is a behaviour difference with the strong_parameters plugin for
Rails 3.2, which does this by default.

Signed-off-by: Alex Coles <alex@alexbcoles.com>