Quailfy columns when searching, fixing issues when eager_graph is used on the model
Don't show many to many edit link for models without many to many associations

Showing them by default leads to a situation where someone clicks
on the link, selects a model object, and then has an empty select
box as no associations are available.
Don't force user to pick many to many association to edit if only one choice is available
Use default empty option when picking a many to many association to edit
Fix ruby 1.8 issue in recently added spec
Bump version to 0.5.2, forme dependency to 0.9.1