Update and rename Html.php to HTML.php

Since the Facade was renamed in `app/config/app.php` on the `laravel/laravel` repo, we should rename the actual file so it is consistent with that of `DB.php`, `URL.php` and the class name respectively.
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 Pluralizer.php

Removed space to trigger rebuild from travis.
Merge pull request #1231 from bencorlett/patch-1

Update and rename Html.php to HTML.php
Merge pull request #1246 from helmut/pluralizer-case-fix

Pluralizer Case Sensitivity
Work on code clean-up.