Trivial fixes
Update debugger gem to version compatible with Ruby 1.9.3-p484 and 2.0.0-p353
Add Rails compatibility details
Create TestUtils module containing Rails version helpers
Rename Gemfile to Gemfile.rails3 in preparation for Rails 4 tests
Create test_db_reset Rake task to set up test database
Rename test/dummy to test/dummy-rails3
Move sqlite3 gem from gemspec into Gemfile.rails3
Add Rails 4 dummy app and Gemfiles