Merge remote branch 'jonleighton/association_fixes'

* jonleighton/association_fixes:
  Add a transaction wrapper in add_to_target. This means that #build will now also use a transaction. IMO this is reasonable given that the before_add and after_add callbacks might do anything, and this great consistency allows us to abstract out the duplicate code from #build and #create.
  Inline ensure_owner_is_persisted! as it is only called from one place
  @target should always be an array
  Rename add_record_to_target_with_callbacks to add_to_target
  Don't pass the block through build_record
  Move create and create! next to build
  Get rid of create_record as it is not only used in one place
  Get rid of AssociationCollection#save_record
  Fix test/cases/connection_pool_test.rb for sqlite3 in-memory db
  Add interpolation of association conditions back in, in the form of proc { ... } rather than instance_eval-ing strings

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