Added a 'traffic' and 'memory' command to the CLI
The bytes2human function doesn't like negative values.  Fixed that.  Changed the 'total' column in the memory operation to be 'allocated'.  It is a better description.
Merge branch 'master' of git://github.com/majrmovies/dotcloud-cli into majrmovies-master

Conflicts:
	ChangeLog.md
cleanup