Add PHPUnit and PEAR_Log as development requirement.

This way you can run tests without manually installing PEAR packages or PHPUnit itself. After cloning the repository you can run tests with:

%composer install
%vendor/bin/phpunit -c phpunit.xml test/

Output of example run of above command in fresh checkout at address below. Some tests are skipped because I do not have memcache, Postgres and OCI installed.

http://pastie.org/8363000