Minor fixes on the README.
Made the dre.py script eXecutable.
Fixed a 500 error we got on some documents.

We have some badly formed links on the original PDFs. Sometimes
we have latin-1 characters on the 'href' attribute of the link. This
originates problems when displaying the document since we're going
to have a document with two encodings (utf-8 and latin-1).
Fixed some seldom used templates

The templates had a wrong path to the static files.