requirements: broken pypi links fix

* Packages removed from pypi have now direct links; this is only a temporary
solution.

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
Makefile: plupload download link fix
Merge remote-tracking branch 'adrianp-github/pu' into pu
BibField: fix producers
JsonAlchey: parser infrastructure
JsonAlchemy: readers
JsonAlchemy: extension enhacement
JsonAlchemy: first try SmartJson
ugly tmp