Update grammar, completions, etc. to PHP 5.5
Insert missing space before argument value
Add keyword "finally" for exceptions

This was added in PHP 5.5, see http://www.php.net/manual/en/migration55.new-features.php#migration55.new-features.finally
Add keyword for "yield"

See http://www.php.net/manual/en/language.generators.overview.php for details
Add highlighting for "trait"

This adds support for traits, which are available since PHP 5.4

Fixes #41.
Add missing escape for \ in support.class.builtin

Correction from 3d925dd3e0068403c56234c40a27d8fd3574025f
Merge branch 'master' of git://github.com/textmate/php.tmbundle