Revert "temporarily ignore test"

This reverts commit e7cbc42.

Author: jeffscottbrown

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

@@ -23,7 +23,6 @@ import spock.lang.Specification
  */
 class IvyExcludeResolverSpec extends Specification{
 
-    @spock.lang.Ignore
     void "Test that the IvyExcludeResolver resolves excludes"() {
         given:"An IvyDependencyManager with some dependencies"
             def dependencyManager = new IvyDependencyManager("foo", "1.0")