Use deep_dup
Add execute
Fix migrate i/f
Fix noop migrate output
Fix warn message
Fix noop output
Update version
Small fix
Fix spec
Fix README
Merge branch 'master' into v0.4.8
Optionize activerecord-mysql-unsigned
Fix gemspec
Add ForeignKey module
Implemented foreign key
Fix README#Help
Update README.md
Update version
Fix indent
Fix