fix: Add forgotten final keyword.

* src/dctc/java/com/dataiku/dctc/GlobalConstants.java: Here.
fix: Implement the equals method.

* src/dctc/java/com/dataiku/dctc/command/Ls.java: Here.
fix: Always close the stream.

* src/dctc/java/com/dataiku/dctc/command/Tail.java: Close in a
  finally.
Set default value for show_git_hash and globbing options

* src/dctc/java/com/dataiku/dctc/configuration/GlobalConf.java: Set to
  false for both. False for globbing due to more api call.
Clone the alias map.

Closes #54.

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