display:output: Create the display subsystem

1) Make a display subsystem. This subsystem will contain the
   modules of displaying data in the CML and GUI.
2) Create a output module. Implemented the data display formated
   in CML console. Currently only support give color to bash.
3) Defined a new class COLORS, contain a templete structure and
   the method of add templete.
4) Defined a new class PrintColor, which is the children of COLORS.
   This class could display formated data in the CML console.
5) Write the test for the two classes and their methods.

Signed-off-by: GuofengLiu <lgf612@sina.com>