In order to request content, we need an absolute URI.  If the input URI is protocol-relative, use "http".
Merge pull request #1667 from AnalyticalGraphicsInc/fixProtocolRelativeProxyUrls

Fix protocol-relative URIs in development proxy.
Fix scissor test spec.
Fix failing billboard collection test on HD 4000.
Merge pull request #1669 from AnalyticalGraphicsInc/scissorTestSpec

Fix failing tests on HD 4000
Merge remote-tracking branch 'upstream/master'