PLA-1481 articles quantity decrease for wiki match
PLA-1452 content namspace support added
PLA-1452 0 namespace only
PLA-1452 content ns + lowered minimal article score
PLA-1482 slop for phrase and query set to 1, for both queries
PLA-1482 exact match field added
const added
content ns added to query /wstydze sie
boosting for xwiki search changed
boosting for xwiki search changed
xwiki score
make 'series_mv_tm' more prominent
tmp fix for american apostrophe
xwiki score
Filter article search by using default quality of 20

Squashed From Commits from Adam Robak

default quality added

quality change

quality change

quality set to 20
Clarify current handling of apostrophe
exrtract wg keys
Use MW function to test if namespace is Talk namespace
Merge remote-tracking branch 'upstream/dev' into dev-pch

Conflicts:
	extensions/wikia/Search/classes/Services/EntitySearchService.php
fix for empty variable