Add options to exclude methods from coverage (Fix #104)

From CLI:

```
$ bin/atoum -d tests/units -nccfm 'randomMethodName'
```

From configuration file (.atoum.php):

```php
<?php

$script->noCodeCoverageForMethods('/^(get|set)/');
```

Bot accept plain method names (strings) or patterns (full patterns with
delimiters)