add a word about PIPELINE_MIMETYPES
fix typo
quote path before passing them to command. fix #335
bump version
rename template tags to be more obvious
experiment with a collector process

The idea is to have a process similar to collecstatic, and
copy files in a temporary directory.

This avoid storage that use finders, streamline dev process with
production process, and make compilers easier to deal with.
update documentation
reintroduce python2.6 support