Add revisions.plist to htdocs for Unity

Legacy/htdocs/autoupdate-revision.unity3d.com/revisions.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+  <plist version="1.0">
+  <dict>
+    <key>plugin</key>
+<string>5.0.3f2</string>
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