fix: isSon, when the son path is the smaller than the file separator.

* src/dctc/java/com/dataiku/dctc/file/FileManipulation.java: Delete
  the condition.
gfile: givenPath.

* src/dctc/java/com/dataiku/dctc/file/GeneralizedFile.java: Here.
* src/dctc/java/com/dataiku/dctc/file/BucketBasedFile.java,
  src/dctc/java/com/dataiku/dctc/file/AbstractGFile.java,
  src/dctc/java/com/dataiku/dctc/file/FTPFile.java,
  src/dctc/java/com/dataiku/dctc/file/HdfsFile.java,
  src/dctc/java/com/dataiku/dctc/file/LocalFile.java,
  src/dctc/java/com/dataiku/dctc/file/SshFile.java: and Implement.
list command: Be aware of the number of source.

Closes #36.

* src/dctc/java/com/dataiku/dctc/command/ListCommand.java: Here