0.3.0 breaks rails 2.3

[webpulser]

I think commit 863e29b1ff7cdb7e283d Breaks rails 2.3 compatibility.

I'm using rails 2.3.8 and multidb 0.3.0 from rubygems.org

Here my application console init log :

```undefined methodcolumns' for class MultiDb::ConnectionProxy'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/module/aliasing.rb:33:in`alias_method'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/module/aliasing.rb:33:in `alias_method_chain'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:7:in`included'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:6:in `class_eval'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/query_cache.rb:6:in`included'
/home/sabre/.gem/ruby/1.8/gems/multi_db-0.3.0/lib/multi_db/connection_proxy.rb:5:in `include'
/home/sabre/.gem/ruby/1.8/gems/multi_db-0.3.0/lib/multi_db/connection_proxy.rb:5
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in`gem_original_require'
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:158:in`require'
/home/sabre/.gem/ruby/1.8/gems/multi_db-0.3.0/lib/multi_db.rb:6
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'

[wael34218]

It happened to me as well