php 5.3 compatible transaction naming closure

Merge pull request #10 from danwall/bug/transaction-name-2

PHP 5.3 transaction names via closure - fixes #8

configurable transaction naming

Merge pull request #7 from danwall/transaction-names

update automatic transaction naming

adds support for laravel 4.1

Merge pull request #3 from PhiloNL/patch-1

Add support for Laravel 4.1