jsonalchemy: fixes for versionable extension

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
documents: checker of source and uri addition

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
documents: test improvements

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
jsonalchemy: cache engine addition

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
travis: travis_retry statement for grunt

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
scheduler: tasklet registry addition

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
pidstore: new pid provider for record ids

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
uploader: first release insert mode
uploader: master format save to bibfmt

* PEP8 fixes
Uploader: enhance workflows with pre and post tasks
Docs: uploader initial docs added