* fix palette handling for converted gifs
* fix gif optimization
* better auto convert paramter for gif save
fixes #513
overwrite redundant Image palette with new ImageCore Palette after quantize, fixes #513
Fix test failure when optimizing the palette on mode L gifs
Test for issue #513
cleanup tempfile
Changes updated
test for issue #434
Merge Changes from master
Merge branch 'dschmidt_palette_513' of https://github.com/wiredfool/Pillow into wiredfool-dschmidt_palette_513
Merge branch 'master' of github.com:python-imaging/Pillow