last modified dates on AIR SDK became unstable.  Switch to using ETags

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1640985 13f79535-47bb-0310-9956-ffa450edef68
last modified dates on AIR SDK became unstable.  Switch to using ETags

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1640992 13f79535-47bb-0310-9956-ffa450edef68
"update md5s"

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1641008 13f79535-47bb-0310-9956-ffa450edef68
try adding a second cacheid.  Adobe servers are returning different ones for the same file

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1641032 13f79535-47bb-0310-9956-ffa450edef68