Revert "temporarily ignore failing spec"

This reverts commit 00ae7db.

Author: jeffscottbrown

grails-bootstrap/src/test/groovy/org/codehaus/groovy/grails/resolve/IvyExcludeResolverSpec.groovy

@@ -17,14 +17,12 @@
 package org.codehaus.groovy.grails.resolve
 
 import org.codehaus.groovy.grails.resolve.ivy.IvyExcludeResolver
-import spock.lang.Ignore
 import spock.lang.Specification
 
 /**
  */
 class IvyExcludeResolverSpec extends Specification{
 
-    @Ignore
     void "Test that the IvyExcludeResolver resolves excludes"() {
         given:"An IvyDependencyManager with some dependencies"
             def dependencyManager = new IvyDependencyManager("foo", "1.0")