Removed deprecated set_table_name set_primary_key set_sequence_name methods

Version 1.5 and later support Rails 4. These methods already deprecated.
See http://guides.rubyonrails.org/3_2_release_notes.html
"8.1 Deprecations"
Merge pull request #364 from yahonda/remove_deprecated_set_sequence_name

Removed deprecated methods from unit tests