Removed redundant modifiers.
Removed redundant throws.

IOException included both the JSON exceptions.
Adding log4j as a dependency.
Cleaning up HipChat main class.

Changing parentheses style.
Adding log4j log calls, replacing exception stack traces.
Making JSON_FACTORY final.
Fix brittle test, code from jaysee00/jHipChat.

When testing creation and deletion of rooms, there is a delay in
deleting a room and the room being reported as deleted in the next call
to `listRooms()`.
Refactoring HipChat.

Moving the POST and GET connection creation into methods, reducing
duplicated code.

Moving the URL creation code into a method.
Cleaning up class.

Fixing indentation.
Changing parentheses/brace style.