Hygiene: Gerrit tool

* Apply Legoktm/Parent5446's suggestions
** switch to core libraries
* P8ify it (include 2 > 4 space indents)
* Allow project as parameter argument
* Add visual separation between > 0 scores and < 0 scores
Change-Id: Ide81eca6fa993f4672b567f71da16e1effc09453
Merge "Hygiene: Gerrit tool"