move vendor to VENDOR_PATH constant to allow configuring it different for kwf tests
add phpunit dependency for running tests

also update to latest phpunit 3.7
fix autoload for Kwf_Filter

problem is that Zend_Loader::loadClass doesn't work correctly as kwf is not in include_path
don't just add zf to include_path, add all libraries from composer include_paths

fixes phpunit autoloading
Autoloader: allow multiple paths for one prefix

required for test classes in kwf

it is not recommended to use that as a file_exists call is required. but if we just use it for tests performance is not that critical
add htmlawed dependency

override with library-tidy wich replaces htmlawed if you have tidy available.