Don't resolve when the first character of the command starts with a dot.

Refs #52.

It's not a `\' like shell alias management cause, the shell replace:

- dctc \ls

by

- dctc ls

We need to write `dctc \\ls' if we set the escape character to `\'.

* src/dctc/java/com/dataiku/dctc/configuration/Alias.java: Here.
ssh: Manage empty directory, and don't make an infinite loop.

* src/dctc/java/com/dataiku/dctc/file/SshFile.java: Add of flag if we
  found `.' and `..'.
ssh: Delete the last trailing end of line.

* src/dctc/java/com/dataiku/dctc/file/SshFile.java: Here.
ssh: Add id_rsa and id_dsa if found and if no key is given.

Closes #56.

* src/dctc/java/com/dataiku/dctc/file/SshFile.java: Here.
* src/dctc/java/com/dataiku/dctc/file/SshFileBuilder.java: Know the
  key is not mandatory.
Delete useless comment.

* src/dctc/java/com/dataiku/dctc/file/SshFileBuilder.java: Here.
Use simplier default display.

* src/dctc/java/com/dataiku/dctc/display/DisplayFactory.java: User
  '\r' character. Prefer the list display for non interactive program.
Don't forget to flush for display.

* src/dctc/java/com/dataiku/dctc/display/AbstractThreadedDisplay.java,
  src/dctc/java/com/dataiku/dctc/display/AbstractTransferRateDisplay.java:
  Here.
In interactive mode, force the display to non pretty display.

* src/dctc/java/com/dataiku/dctc/display/DisplayFactory.java: Here.