Fixed: Disable the unused CrapMetric rule.

The incomplete definition of this rule was causing warning messages during CodeNarc execution:
"The Cobertura XML file [null] is not accessible; skipping this rule"

(cherry picked from commit 4f0b99b)

Author: jacopoc

config/codenarc/codenarc.groovy

@@ -368,7 +368,7 @@ ruleset {
     // rulesets/size.xml
     // TODO : need refactoring AbcMetric   // Requires the GMetrics jar
     ClassSize
-    CrapMetric   // Requires the GMetrics jar and a Cobertura coverage file
+    // CrapMetric   // Requires the GMetrics jar and a Cobertura coverage file
     // TODO : need refactoring CyclomaticComplexity   // Requires the GMetrics jar
     MethodCount
     // TODO : need refactoring MethodSize