Fix #369 : Invalid albums in the artist view
simplify Set->List in ArrayIndexerAdapter
avoid NPE in SongsFragment
call simpler Artist constructor
remove useless line
fix unnecessary multiple requests for album year and path
Merge pull request #390 from hurzl/ext2

Small misc. fixes
Add classpath files for projects without.

Add classpath files for projects without them, this will
significantly cut down on eclipse initial import errors.