Delete .DS_Store
Merge branch 'step4' of https://github.com/ibeauvais/PlayWithJava8 into step4
add loadUsersFromMultipleCsv
improve comment
Merge branch 'step4' into step4-solution

Conflicts:
	src/main/java/fr/xebia/xke/java8/step4/FileUtils.java
	src/main/java/fr/xebia/xke/java8/step4/NumberUtils.java