Allow to specify `$prefix` and `$suffix` for `Orchestra\Support\Str::replace()` helper.

Signed-off-by: crynobone <crynobone@gmail.com>
Rename testcase namespace.

Signed-off-by: crynobone <crynobone@gmail.com>
Update to use guard-phpunit2.

Signed-off-by: crynobone <crynobone@gmail.com>
Add testcase for Orchestra\Support\MessagesServiceProvider.

Signed-off-by: crynobone <crynobone@gmail.com>