Fix tests

+ Correct lines count (oops)
+ Correct list of duplicates computation
solución fede
Merge new tests
Merge branch 'upstream-master' into solucion-fede

Provide impl (wrong)

Fix Conflicts:
	src/main/scala/Duplicates.scala
passing tests
Integrar branch more-in-tests

+ Mover el resto de los números a Solutions
+ allSongs: Seq[Long]
Merge branch 'upstream-master' into solucion-fede

Conflicts:
	src/main/scala/Duplicates.scala
Merge pull request #6 from fedesilva/solucion-fede

Solucion fede