PLA-342 adding language code to search config, change in building query on interwiki search so it uses config for getting that
PLA-341 adding lang param support to config
PLA-341 filter out exact match that do not meet language in param
PLA-341 code cleaning
PLA-308 added and changed tests, small changes for cross wiki documentation
PLA-341 adding covers param to unit test
PLA-342 moving check if lang is correct to config, added acquiring wiki language
PLA-342 get lang code from different location
PLA-342
PLA-342 make lang parameter required
PLA-342 doc change
PLA-308 changes in test, and config due to test
PLA-310 adding lang to requested fields list
Merge branch 'PLA-310' into PLA-308

Conflicts:
	extensions/wikia/Search/SearchApiController.class.php
PLA-308 change in documentation examples
Merge branch 'PLA-308' into dev

Conflicts:
	extensions/wikia/Search/classes/Test/QueryService/Select/InterWikiTest.php
PLA-308 fixing unit tests