Fixes failing tests in PHP 5.3 from f942de6.

No math required to check if NAN is identical to a value.
Closes #816
Merge pull request #811 from whatthejeff/php53_nan_identical

Fixes failing tests in PHP 5.3 from f942de6.
Updated ChangeLog
Upgrade PHP_CodeCoverage
Fix CS/WS
Prepare release
Attempt at backporting composer.json and .travis.yml changes from master