Skip the test folder for coverage.

Possible source of nose -> coveralls inconsistency.
Merge pull request #19 from leonardt/skip-tests-coverage

Skip the test folder for coverage.
Refactoring omp tests+adding some, fixing ocl macro tests.
Merge pull request #20 from leonardt/test-refactor

Refactoring omp tests+adding some, fixing ocl macro tests.
Full coverage on c nodes
Merge pull request #21 from leonardt/full_c_nodes_coverage

Full coverage on c nodes
More test coverage.
Merge pull request #22 from leonardt/more_test_coverage

More test coverage.