Renaming result

The paper-timelapse-script now uses subprocess.call instead of sp.Popen,
since that waits for completion. We can then rename the file in the end,
so we will end up with a batch of correctly named PDFs.
Timealpse script updated and pep8yfied

- code cleanup
- to save some space we delete the hidden .svn and the movie directory,
since we don't need them for the timelapse of the paper. Deleting with
shutils.rmtree, according to http://stackoverflow.com/a/303225