Initial support for ActiveRecord 4. Dropping support for older versions.
Fixed sequence_name
schema_name has been fixen in rails master
Address ArgumentError: wrong number of arguments (5 for 3) since f09bb33bb534fe2e729e292c8ac6b0e2ffdcea2a
Merge pull request #166 from yahonda/address_wrong_number_of_arguments_5_for_3

Address wrong number of arguments 5 for 3
Support refactored remove_column
Merge pull request #172 from yahonda/remove_column_column_names_rails4

Support Refactored remove_column with Oracle
Address DEPRECATION WARNING: the object returned from `select_all`
 must respond to `column_types`.
Merge pull request #173 from yahonda/address_no_method_error_column_types_rails4

Address NoMethodError: undefined method `column_types'
Bumped jeweler, ruby-plsql and ruby-oci8 version.
Merge pull request #176 from yahonda/bump_gems_rails4

rails4: Bump jeweler, ruby-plsql and ruby-oci8 gems to the latest version
Address 3 failures after #173 merged.

Rails 4 `select_all` should return `ActiveRecord::Result`
but these tests are still expecting `Array`. select_all return value casted to Array.
Merge pull request #180 from yahonda/address_issue_179_rails4

rails4: Address 3 failures after #173 merged.
To support _field_changed? method renamed from field_changed?

See https://github.com/rails/rails/pull/3544
Merge pull request #182 from yahonda/address_issue_177_rails4

Support _field_changed? method renamed from field_changed?
Setting default_timezone := local explicitly.
Merge pull request #184 from yahonda/address_date_types_rails4

Address 6 failures at oracle_enhanced_data_types_spec.rb
Address 2 failues since numeric_changes_from_zero_to_string? method implemented at Rails.
Merge pull request #190 from yahonda/field_changed_rails4

rails4: Address 2 failures at nested_attributes_test.rb
Fix rails issue 6819.