clean: Alias.

* src/dctc/java/com/dataiku/dctc/configuration/Alias.java: Direct
  copy, comments.
clean: Delete manually iterator.

* src/dctc/java/com/dataiku/dctc/configuration/Configuration.java:
  Hidde the java stuff and print the end of line at the right place.
conf: Add a comment on News.txt

* News.txt: Comments could not be inline.
clean: Factorize, clean, check style.

* src/dctc/java/com/dataiku/dctc/configuration/Configuration.java:
  Here.
Factorize the code.

* src/dctc/java/com/dataiku/dctc/configuration/CredentialProviderBank.java:
  Here.