Fix typo in mutableList test

testTuncrate → testTruncate
Fix ceylon.collection group test

{ "last", "list" } is now lazy, therefore its string has '{}' instead of
the necessary '[]'.
Fix ArrayList.replaceX methods

* replace would hang up forever because it didn't increase its counter
* replaceFirst and replaceLast didn't actually replace
Add replace test for MutableLists
Merge pull request #229 from lucaswerkmeister/master

Fix ArrayList.replaceX methods, other small fixes