Improve help text for --lock and --unlock options.
Issue #2005196 by juampy: Wrong logic when merging two site aliases
Issue #2029493 by helmo: Fixed testBackendMethodPost fails on php 5.4.
Issue #2019059 by jp.stacey, ergonlogic: Fixed phpunit installation documentation needs updating.
Document the --project option for core-status.
Issue #2027703 by jonhattan: Fixed Drush make --prepare-install doesn't retain chmod values.
Issue #934472 by c960657, greg.1.anderson | robertDouglass: Fixed memcache is not cleared on 'drush cc theme'.