* master:
  Fixes #1248: url manager didn't handle array parameters well.
  travis: speed up composer
  fixes #1306
  fixed travis and composer issue
  fixed array helper test
  fixed Sort test
  some clarification on model docs
  fixed Sort::params to be retrieved from Request instead of $_GET
  revokeAll() implementation for PhpManager
  revokeAll() implementation for DbManager
  added abstract function revokeAll()
  indentation fix
  fixes #1303: Security::decrypt now returns null w/o error when null is passed as $data
  Added link to new RBAC page
  added link to forum thread
  Basic information about RBAC
  RBAC documentation
  added revokeAll() test
  refactored redis AR Query::scalar()

Conflicts:
	.travis.yml