Always cleanup tempdir

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6137 7882d7ee-46e0-0310-a255-a28a61b628e4
only supply imagemagick with quality settings when we have a setting.

setting quality on -1 will let imagemagick decide what to use

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6138 7882d7ee-46e0-0310-a255-a28a61b628e4