Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, larowlan, Damien Tournoud: Replace all remaining superglobals (, , etc.) with Symfony Request object.

Issue #2009584 by rteijeiro, ry5n: Fixed Allow double underscores to pass through drupal_clean_css_identifier() as per new CSS standards.

Issue #1431658 by Albert Volkman, kid_icarus, ChinggizKhan, xjm, rgristroph, connork: Clean up API docs for many system tests