support for wildcards (glob) in exclude

[tsteur]

Currently, only real paths are allowed. This would allow to exclude paths like /home/project/plugin/*/integration-tests.

Example

This would allow us to define testsuites as follows

   <testsuite name="SystemTests">
        <directory>./System</directory>
        <directory>../../plugins/*/tests</directory>
        <exclude>../../plugins/*/tests/Integration</exclude>
        <exclude>../../plugins/*/tests/Unit</exclude>
    </testsuite>
    <testsuite name="IntegrationTests">
        <directory>./Integration</directory>
        <directory>../../plugins/*/tests/Integration</directory>
    </testsuite>
    <testsuite name="UnitTests">
        <directory>./Unit</directory>
        <directory>../../plugins/*/tests/Unit</directory>
    </testsuite>

Basically, in SystemTests we want to run all tests that were not grouped into Unit or Integration tests as plugins might not follow guidelines to put them into a Unit or Integration directory and to stay backwards compatibility. We would maybe even create a new suite for uncategorized tests or something similar.

With the current behavior we would execute in SystemTests all tests of UnitTests and IntegrationTests as well but we want to exclude them. There can be many plugins which even very from installation to installation and it is therefore not possible to define fixed directories.

[mnapoli]

bumping! Please consider merging this little change :)