[Sluggable] add test to prove issue with slug ending with 0XYZ
{Sluggable] fix issue with slug ending with 0XYZ
Merge pull request #632 from jaugustin/fix-sluggable-exception

Sluggable fix an exception with slug endding with 0XXX
Fix CS
Prepare 1.6.9 release
Merge branch '1.6'

Conflicts:
	CHANGELOG
	generator/default.properties
	runtime/lib/Propel.php