migration versioning

• include the rails version in the migration, if supported (thanks @YoranBrondsema!)
• readme tweak (thanks @olleolleolle!)

preserve dependent: :nullify

v0.3.5

v0.3.5

better invalid foreign key detection

v0.3.4

v0.3.4

ability to ignore associations

v0.3.3

v0.3.3

rake task for CI

v0.3.2

update license year(s)

fix schema dumping regression

v0.3.1

v0.3.1

compat fixes, better invalid key detection

v0.3.0

v0.3.0

rails 4.2

v0.2.0

v0.2.0

gemspec bugfix

v0.1.8

v0.1.8, fix broken gemspec, closes #13

rails 4.1, habtm fix

v0.1.7

v0.1.7