Revert "Bug 1014180 - Update node_modules for test-agent update"

This reverts commit dbccfa4909974b3f4a48bdcd54f60e95991f78d9.
Revert "Bug 1004453 - gaia-integration test failures sometimes reporting a test name of 'undefined'"

This reverts commit 90141fe841112d8af7161b8a73048d1843965c62.
Bug 1014180 - Update node_modules for test-agent update
Merge pull request #37 from mozilla-b2g/release

Revert gaia-mocha changes, and re-apply test-agent changes