Incompatibility with activerecord 4.1.0.beta1

[eagletmt]

I found 2 incompatibilities with activerecord 4.1.0.beta1.

First, quote_value requires the second argument.
rails/rails@31a43eb
I think it can be fixed easily by passing nil explicitly.

Second, the SQL statement generated from count changes.
rails/rails@da9b5d4
In acts-as-taggable-on, tags.count or tags.empty? performs an invalid query.
Using tags.count(:all) may solve this issue.

[bf4]

Thanks for the links. Would you want to make a pull request?

[eagletmt]

@bf4 I've made a pull request. Please review it.