Moved a bunch of imports in the defaultfilters library out of functions.  On CPython this is actually a big performance win if one of these filters is your bottleneck.
Moved a bunch of imports in the defaultfilters library out of functions.  On CPython this is actually a big performance win if one of these filters is your bottleneck.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@16283 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django