Added support for multiple model directories

[koenpunt]

As the title says, support for multiple model directories. Could be a solution for #163

The set_model_directory and get_model_directory functions still work as they are proxied to set_model_directories and get_model_directories.

Note, view the diff with ?w=1, because the <CR>'s (carriage returns) are removed.

[jpfuentes2]

OCD: remind removing the superfluous line?

[jpfuentes2]

Would it be too much to ask to also add a test for this change under this?

[koenpunt]

Rebased and updated with your comments, will look into adding an additional test.

[koenpunt]

On second thought, the test uses set_model_directory, which is nothing less than a proxy to set_model_directories ($this->set_model_directories(array($dir));). But if you prefer a test I can add one later.

[jpfuentes2]

Please, if you don't mind. I would very much appreciate a test. This is a widely used library and a test can also serve the purpose of me not breaking your changes later on down the road :).

[koenpunt]

@jpfuentes2 ping, added tests.

[ryangurn]

how do i get these changes into my application?

[koenpunt]

If you're using a git checkout of php-ar you can simply merge my branch (git pull https://github.com/fetch/php-activerecord multiple_model_dirs). Otherwise you can apply the diff to your current source: https://github.com/kla/php-activerecord/pull/246.patch (patch -p1 < 246.patch)

[ryangurn]

ok cool thanks

[al-the-x]

Looks like this PR supersedes #330... And there's more discussion here.

[al-the-x]

Should definitely consider this for 1.1, since it's a long outstanding issue.