Updated mediawiki/extensions
Project: mediawiki/extensions/UniversalLanguageSelector  3782c8c3a50a6f36330281c08adb632a457c8269

Page element id attributes now have "uls-" prefix

Fixes failing Selenium tests.

Also:
- updated Ruby to version 2.1.2,
- updated all Ruby gems.

Paired with: Kartik Mistry

Change-Id: I1c614cb77f0760d6a84310ce602b0934f07445de