RUBY-691 adding coverage reporting to the 1.x-stable branch

* added coveralls reporting to 1.x stable
* changed the default test suite to address a gap in testing with extensions
* cleaned up testing/commit rake tasks a little (much more to do here)
RUBY-691 removing redundant or unused tests
RUBY-691 standardizing class names, constants, tabbing and connections in tests
RUBY-691 introduction of helpers, refactor of test_helper
RUBY-691 refactor of test related rake tasks