Remove context indexes after each test
Merge pull request #400 from yahonda/oracle_text_support_12c_sandbox

Remove context indexes after each test
Pending two tests which always fail when tested with Oracle 12c
Needs investigation after some Patch Set Updates and/or Patch Set released
Merge pull request #401 from yahonda/skip_two_tests_when_oracle12c_used

Pending two tests which always fail when tested with Oracle 12c
Use OCI8::Metadata::Base#obj_link to fix rsim/oracle-enhanced#399.
Merge pull request #403 from kubo/issue-399

Use OCI8::Metadata::Base#obj_link to fix rsim/oracle-enhanced#399.