Add multiple Gemfiles for different active record versions.
Don't put Gemfiles in a directory.
Update Travis CI matrix exclusions.
Add MySQL2 adapter for ActiveRecord2.
Silence STDERR when running specs.
Update to RSpec 2.14, and fix deprecation warnings.
activerecord mysql2 adapter is not needed in JRuby.
Merge pull request #144 from wvanbergen/ruby_18_handling

Add multiple Gemfiles for different active record versions.