Support for multiple model directories

[simonharrer]

In case of having something modular like a Joomla application, you only want to run php-activerecord for the whole application reusing the models of different components.

My suggestion would be to alter the autoloading to check each model directory for a specific model in means of occurence in the array. Additionally, a method add_model_directory as well as remove_model_directory should be added. the set and get_model_directory methods could stay stable as the set_model_directory delegates to the add method and the get_model_directory only returns the last set directory. This would ensure backwards compatability.

[cvanschalkwijk]

87f0732 You can try this branch for your issue, set_model_directory will also accept arrays

[simonharrer]

This looks good. Will this go into the master branch? If so, the documentation of the field and its setter and getter has to be adapted.