workflows: change default XSLT

* Changes the XSLT parameter in the example workflow
  "full_doc_process".

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
installation: Python 2.6 on Travis CI

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reviewed-by: Jiří Kunčar <jiri.kuncar@cern.ch>
installation: Flask-Collect to use 0.2.3-dev

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reviewed-by: Jiří Kunčar <jiri.kuncar@cern.ch>
access: using unittest2 in Python 2.6

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reviewed-by: Jiří Kunčar <jiri.kuncar@cern.ch>
workflows: Python 2.6 compatibility

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reviewed-by: Jiří Kunčar <jiri.kuncar@cern.ch>
oaiharvest: reliability improvement and docs

* Prints not only error logs for every workflow, but also
  everything with a superior code error (40) like critical.

* Removes useless part of code.

* Adds basic sphinx documentation syntaxes to various functions.

* Reactivates mails and tickets for harvesting process.

Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Guillaume Lastecoueres <guillaume.lastecoueres@cern.ch>