Refactor: rename EndToEndTest to V1ApiConformanceTest
Refactor: rename test to text_expected_normal_behaviour
Refactor: rename #run_rss_loader_with to #run_rss_loader_using, json to actual_json
Restore end_to_end_test.rb

This actually tests v2 of the api; the v1_api_conformance_test, to
which end_to_end_test was originally renamed, is actually a different'
test entirely.
Simplify json comparison code
Remove all code retired due to simplified json matching scheme
Refactor: inline method assert_json_equal