Add .gitattributes

[garak]

This is also fixing #639

[mikeSimonson]

@garak Thanks

[alcaeus]

I'm not sure this is a good idea. This will cause a severe difference between running composer install --prefer-source and composer install --prefer-dist. IMO it would be better to split up into a lib and tests folder as we do on many other repositories (and as #641 suggested). What do you think @mikeSimonson?

[garak]

What would be the problem with such difference?

[alcaeus]

For starters, the issue you linked above is only fixed for some people. People with source installs still have the test sources available in their autoloader.

[garak]

Ah OK, I didn't realize that. Anyway, the issue is still open

[Ocramius]

@alcaeus we do it on all other repos and it's fine. The tests are NOT public API anyway, so whoever is installing the package as a dependency shouldn't care about whether they are there or not.

[mikeSimonson]

Well the next steps are

• to reorganize the repo with the tests outside the rest of the src folder
• and the autoload-dev feature of composer.json