made source filetype a property so we dont check filetype until needed, also made imagemagick use TIFF as opposed to png32. Also we need a larger size from imagemagick when using autocrop, we default to 3* for that and crop, its just a guess in either case.
made source filetype a property so we dont check filetype until needed, also made imagemagick use TIFF as opposed to png32. Also we need a larger size from imagemagick when using autocrop, we default to 3* for that and crop, its just a guess in either case.

--HG--
extra : convert_revision : svn%3A18c32c52-eb3f-0410-93bd-f15eff1430f4/trunk%40325

dantium/sorl-thumbnail