Fix typo.
testrunner.htm: fix undefined variables.
Remove unused variables.
Merge pull request #487 from XhmikosR/unused

Remove unused variables.
Merge pull request #486 from XhmikosR/testrunner-undef

Fix undefined variables and typo
Enable JSHint's `eqeqeq` rule and remove `eqnull`.
Enable strict mode.
Fix test failures after the strict comparison changes.