Add formula for parsekit 1.3.0 (from pecl) for php54

I'm submitting this pull request as a call for help because I can't get it to work and hope someone knows what's wrong.

Both through `brew install Formula/php54-parsekit.rb` and through `pecl install parsekit` the installation fails to finish `make`.

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**EDIT**: Caused by [bug #61187](https://bugs.php.net/bug.php?id=61187) (parsekit hasn't been updated for breaking changes in php 5.4), I've added a patch to the formula.