BibIndex: journal page tokenizer

* Adds tokenizer `BibIndexJournalPageTokenizer`

* Adds tag `773__c`, field and index for `journalpage`

* Adds upgrade script

* Adds unit and regression tests

* Fixes journalpage keyword translation in websearch

Signed-off-by: Federico Poli <federico.poli@cern.ch>
BibAuthorID: Changed all varchar 256 to 255 in bibauthorid tables.

Signed-off-by: Artem Tsikiridis <artem.tsikiridis@cern.ch>
BibUpload: linting
Merge pull request #59 from Osso/bibupload-linting

BibUpload: linting
Merge pull request #58 from atsikiridis/prod

BibAuthorID: Changed all varchar 256 to 255 in bibauthorid tables.
Merge pull request #48 from fpoli/prod-bibindex-journal-page-tokenizer

BibIndex: journal page tokenizer
drone: detect apache version
Drone: add .drone.yml
drone: load bibfield conf
drone: change base image