Ensure a source map loads for resources with sourceMappingURLs.


== Running test suite: Network.SourceMap
-- Running test case: Network.SourceMap.Stylesheet
PASS: Stylesheet Resource should be created.
PASS: Resource should have loaded 1 SourceMap.
PASS: SourceMap should be a WI.SourceMap instance.

-- Running test case: Network.SourceMap.Script
PASS: Script Resource should be created.
PASS: Resource should have loaded 1 SourceMap.
PASS: SourceMap should be a WI.SourceMap instance.