Changed output location for coverage reports in lettuce tests.
Changed output location for coverage reports in lettuce tests.

edx/js-test-tool,kyroskoh/js-test-tool,edx/js-test-tool,kyroskoh/js-test-tool,edx/js-test-tool,edx/js-test-tool,kyroskoh/js-test-tool,kyroskoh/js-test-tool