ok, looking at this some more, there are a lot more cases where URIs get mangled by the TemplateCompiler.
the PluginEnvironment returns a URI string, and then TemplateCompiler mangles it with normalizeUri, which is buggy in a couple ways. it seems to me that TemplateCompiler is being unreasonably paranoid. it should be able to trust the result from PluginEnvironment. so, new snapshot will just remove the normalization. http://codereview.appspot.com/88118
