title: activiti-designer-5.18.0 mvn package wrong
body: <h3>i checked activiti-designer-5.18.0 tag and mvn package wrong,it seems that the <a href="http://download.eclipse.org/graphiti/updates/0.11.4" rel="nofollow noreferrer">http://download.eclipse.org/graphiti/updates/0.11.4</a>. can't found.how can i resolve this.The console is blow:</h3>
  
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>➜  Activiti-Designer-activiti-designer-5.18.0 mvn package
  [INFO] Scanning for projects...
  [INFO] Computing target platform for MavenProject: org.activiti.designer:org.activiti.designer.libs:5.18.0-SNAPSHOT @ /Users/qk/Downloads/Activiti-Designer-activiti-designer-5.18.0/org.activiti.designer.libs/pom.xml
  [INFO] Fetching p2.index from http://download.eclipse.org/releases/luna/ (0B at 0B/s)
  [INFO] Adding repository http://download.eclipse.org/releases/luna
  [INFO] Fetching p2.index from http://download.eclipse.org/releases/luna/201406250900/ (0B at 0B/s)
  [INFO] Fetching p2.index from http://download.eclipse.org/releases/luna/201409261001/ (0B at 0B/s)
  [INFO] Fetching p2.index from http://download.eclipse.org/releases/luna/201501121000/ (0B at 0B/s)
  [INFO] Fetching p2.index from http://download.eclipse.org/releases/luna/201502271000/ (0B at 0B/s)
  [INFO] Adding repository http://download.eclipse.org/graphiti/updates/0.11.4
  [ERROR] Internal error: java.lang.RuntimeException: Failed to load p2 repository with ID 'Graphiti' from location http://download.eclipse.org/graphiti/updates/0.11.4: No repository found at http://download.eclipse.org/graphiti/updates/0.11.4. -&gt; [Help 1]
  org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: Failed to load p2 repository with ID 'Graphiti' from location http://download.eclipse.org/graphiti/updates/0.11.4
   at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:121)</code></pre>
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