Fix colours in mach terminal formatter.
Bug 945222 - Update web-platform-tests to revision 884e400332e6f8b18700d9e907c322c16f46fc52

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rename : testing/web-platform-tests/tests/conformance-checkers/html/elements/meta/meta-extensions => testing/web-platform-tests/tests/conformance-checkers/html/tools/meta-extensions
rename : testing/web-platform-tests/tests/conformance-checkers/html/elements/meta/names-generate.py => testing/web-platform-tests/tests/conformance-checkers/html/tools/meta-name.py