Ensure dynamic method are generated before testing they don't override existing ones
Remove duplicate dependency on coveralls in gemspec
Update Travis configuration: added 2.1.0, 2.1.1, rbx-19mode -> rbx
Merge branch 'master' into regexp
Add lib/arel/visitors_extensions.rb containing (monkey-)patches for Arel::Visitors
Regexp support: added Arel 4.0 compatibility