Allow dctc-eclipse.sh and dctc-jar.sh to be linked to.

* dctc-eclipse.sh, dctc-jar.sh: no change directory, readlink for
  getting the real path, absolute path for library and source
  detection.
clean: Imports and non closed stream.

* src/core/java/com/dataiku/dip/utils/DKULogger.java,
  src/dctc/java/com/dataiku/dctc/DCTCLog.java,
  src/dctc/java/com/dataiku/dctc/configuration/SshConfig.java: Here.
ssh: Read config file, set identity, set compression level.

Closes #60.

* src/dctc/java/com/dataiku/dctc/configuration/SshConfig.java,
  src/dctc/java/com/dataiku/dctc/file/SshFile.java,
  src/dctc/java/com/dataiku/dctc/file/SshFileBuilder.java: Here.
Fix: Integer reader.

* src/dctc/java/com/dataiku/dctc/file/SshFile.java: Here.
If no identity file in the ssh config, get the one defined in the Dctc conf.

* src/dctc/java/com/dataiku/dctc/file/SshFile.java: Here.