title: Can't install spock to grails 1.3.7 project
body: <p>I created a simple hello world grails app using Grails 1.3.7:</p>
  
  <pre><code>grails create-app hello
  grails create-controller hello
  </code></pre>
  
  <p>Then I try to install the spock plugin using:</p>
  
  <pre><code>grails install-plugin spock
  </code></pre>
  
  <p>And I get the following:</p>
  
  <pre><code>Error loading event script from file [/Users/wholladay/.grails/1.3.7/projects/hello/plugins/spock-0.6/scripts/_Events.groovy] startup failed:
  Could not instantiate global transform class org.spockframework.compiler.SpockTransform specified at jar:file:/Users/wholladay/.ivy2/cache/org.spockframework/spock-core/jars/spock-core-0.6-groovy-1.8.jar!/META-INF/services/org.codehaus.groovy.transform.ASTTransformation  because of exception org.spockframework.util.IncompatibleGroovyVersionException: The Spock compiler plugin cannot execute because Spock 0.6.0-groovy-1.8 is not compatible with Groovy 1.7.8. For more information, see http://versioninfo.spockframework.org
  Spock location: file:/Users/wholladay/.ivy2/cache/org.spockframework/spock-core/jars/spock-core-0.6-groovy-1.8.jar
  Groovy location: file:/usr/local/Cellar/grails/current/lib/groovy-all-1.7.8.jar
  </code></pre>
  
  <p>So I went to: <a href="http://versioninfo.spockframework.org" rel="nofollow">http://versioninfo.spockframework.org</a> and noticed that there is a version 0.6-groovy-1.7 of spock. So I tried:</p>
  
  <pre><code>grails install-plugin spock 0.6-groovy-1.7
  </code></pre>
  
  <p>But then I got the following error:</p>
  
  <pre><code>Error resolving plugin [name:spock, group:org.grails.plugins, version:0.6-groovy-1.7].
  </code></pre>
  
  <p>Plugin not found for name [spock] and version [0.6-groovy-1.7]</p>
  
  <p>Any ideas?</p>