add snippet to convert rails 2.3 queries to 3.0
fix blank lines in rspec code
use synvert-core 0.4.2
use synvert-core 0.4.3
add snippet to convert mailers from rails 2.3 to 3.0
convert <% fields_for ... %> to <%= fields_for ... %>
rename convert_queries_2_3_to_3_0 to convert_models_2_3_to_3_0
add upgrade_rails_2_3_to_3_0 snippet