test coverage now is 97%, fixed drop_extension method for postgres adapter
Add SimpleCov threshold support

Task 13294
Task 13362
Revise test descriptions, formatting

Task 13294
Task 13362
Fix metric_fu configuration

Task 13294
Task 13362
Fix duplicate method call critiques; revise formatting

Task 13294
Task 13362
Handle uncommunicative variable name critique

Task 13294
Task 13362
Handle line length critiques; revise formatting

Task 13294
Task 13362
Adjust SimpleCov threshold

Task 13294
Task 13362
Add metric_fu results

Task 13294
Task 13362
Task 13294 fixed specs for Postgres 9.3
Merge TMXCredit/pg_power#46 v2.0.1 'origin/improve_test_coverage_to_97'

Task 13294
Task 13362

* origin/improve_test_coverage_to_97:
  Task 13294 fixed specs for Postgres 9.3
  Add metric_fu results
  Adjust SimpleCov threshold
  Handle line length critiques; revise formatting
  Handle uncommunicative variable name critique
  Fix duplicate method call critiques; revise formatting
  Fix metric_fu configuration
  Revise test descriptions, formatting
  Add SimpleCov threshold support
  test coverage now is 97%, fixed drop_extension method for postgres adapter