Remove bug in runner which break ligt report.
Remove duplicate line.
Remove duplicate line.
Merge pull request #317 from mageekguy/upstream/bugs/reports/light

Remove bug in runner which break light report.
Merge remote-tracking branch 'upstream/master'
Add ->isNull, ->isNotNull, ->isCallable, ->isNotCallable, ->isNotTrue, ->isNotFalse support to variable asserter.