Added interface definition for ll_ndel()
Added implementation for ll_ndel()
Added test for testing deletion by predicate
Reimplement ll_ndel()
Added interface definition for ll_find()
Added implementation for ll_find()
Merge pull request #153 from matthiasbeyer/implement-ll_find

Implement ll find
Merge pull request #148 from matthiasbeyer/implement-ll_ndel

Implement ll_ndel()