Update Pluralizer.php

Added a matchCase method to attempt to determine case format and apply it but fallback to default value if not found. Added matchCase to the irregular and inflected return values.
Update SupportPluralizerTest.php

Add tests to support new case 'aware' plural and singular methods.
Update Pluralizer.php

Removed space to trigger rebuild from travis.
Merge pull request #1246 from helmut/pluralizer-case-fix

Pluralizer Case Sensitivity