release: version 1.7.30.4 -> 1.8.31.2
Added query parameter to make the other query parameters 'sticky' by returning cookies that set them so are passed in subsequent requests.
Allow admin paths to be set at server scope.
readme: 1.4.6 -> 1.6.0
Merge remote-tracking branch 'origin/trunk-tracking' into matterbury-sticky-options

if it merges an updated upstream into a topic branch.
Added system test for sticky options.
Moved cookie option tests to common test script.
Merge pull request #700 from pagespeed/matterbury-sticky-options

Added query parameter to make the other query parameters 'sticky' ...
options: support StaticAssetPrefix
Merge pull request #707 from pagespeed/jefftk-fix-static-asset-prefix

options: support StaticAssetPrefix
Merge remote-tracking branch 'origin/trunk-tracking' into xqyin-color-messages2
Merge branch 'master' into xqyin-color-messages2

Conflicts:
	README.md