Feature forbid relative path in includes

It forbids the usage of this form __"../folder/file.h"__

### Rule details:
__XML tag key text:__ RelativePathInInclude
__XML tag value:__ (0 or false to not forbid relative path up access; anything else to forbid them.), it's on by default
__Error type:__ RELATIVE_PATH_IN_INCLUDE
__Error tag:__ RPI
__New function:__ CheckRelativePathInInclude

__Tests:__
Except for the second test, kwsRunKWStyleTest, all tests are passing. kwsRunKWStyleTest is failing without my changes which indicates an unrelated problem (visual studio 2012 on windows).

__Note:__
This branch is based off the one in pull request #8, so it includes 2 features.
Pull request #7 needs to be applied for the line numbers to be calculated correctly or use the LineLength rule before this one in the xml file.