Added Join to the factory

Fixes #37
Adds integration documentation for Symfony and Zend Framework 1 & 2
Add laravel integration guide
Fixes typo and modifies copy for Laravel docs
Updates Laravel, ZF1 and ZF2 docs after testing. Creates necessary repository
Merge branch 'base-type-documentation' of https://github.com/AndyBursh/Doctrine-Specification into base-type-doc
Added links to framework instructions
Merge branch 'base-type-doc'