Added new lint rule to forbid usage of "using namespace"

__XML tag key text:__ UsingDirectives
__XML tag value:__ (0 or false to not forbid using directives; anything else to forbid them.), it's on by default
__Error type:__ USING_DIRECTIVES
__Error tag:__ UND
__New function:__ CheckUsingDirectives


__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:__
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.