SCOAP3: JATS integration for Springer

* JATS integration.
* Fix for author name extraction.
Adding official templates
Cleaning Makefile, adding missing ja5_art501.zip
Add .gitignore
Improvements to the Makefile
Introduced OAI-PMH Hindawi bibfilter
SCOAP3: JATS intergated in 90%
SCOAP3: JATS separation

* Separeates JATS conversion scripts from Springer package.
SCOAP3: minidom utils separation
SCOAP3: JATS utils fixes
SCOAP3: Error catching for Elsevier

* Adds catching errors for Elsevier and continue harvest.