see #1227
tgz reduced from 79M(395M uncompressed) to 56M(193M uncompressed)
see #1227
macosx zip reduced from 126M(390M uncompressed) to 120M(370M uncompressed)
see #1227
windows zip reduced from 95M(403M uncompressed) to 83M(363M uncompressed)
see #1227
using ant zip target on macosx build
setting zip compression level to 9
updated revisions.txt
Merge branch 'ide-1.5.x-download-size-1227' into ide-1.5.x