ERT-601: Moved ExtendedTestCase to become a normal ert package.
ERT-601: Updated all Python test to use ert.test for importing ExtendedTestCase
ERT-601: Moved TestArea from ert.util to ert.test
ERT-601: Moved module ert_test_context from ert.enkf to ert.test
ERT-601: Removed commented out code.
Merge pull request #484 from joakim-hove/ERT-601-refactor-ExtendedTestCase

Ert 601 refactor extended test case