Fix binary column issue. #187.
Fix deleting records, uncomment out old tests that caused this issue to be missed. #229.
Updated history.
Manually add info about 6.0.7 release.
fixed active_model/dirty (LoadError)

https://github.com/composite-primary-keys/composite_primary_keys/commit/c9d02647754cc403e5f35dbe54ed5f36507811bc
this commit remove active_model/dirty.rb but require 'active_model/dirty'
Merge pull request #249 from shiro16/ar_4.1.x

fixed active_model/dirty (LoadError)
Remove unneeded require.
Update to version 7.0.12
Ah 7.0.11 was never released, so back to that.
Update for rails 4.1.7
Merge pull request #253 from tomhughes/rails417

Update for rails 4.1.7
Merge branch 'master' into ar_4.1.x

Conflicts:
	composite_primary_keys.gemspec
	lib/composite_primary_keys/relation.rb