NodeUtil.renameNode() was rewritten in this commit and no longer works if a path is passed as the newName parameter. The MoveMigrationTask calls MigrationUtil.renameAndMergeNodes(pagesNode, "templates/pages", false, true);, which passes 'templates/pages' to NodeUtil.renameNode(), resulting in the following:

2013-10-15 16:08:24,715 ERROR info.magnolia.module.InstallContextImpl : > Unable to move Templates and Paragraphs for the following module:gato
javax.jcr.RepositoryException: invalid name: templates/pages
at org.apache.jackrabbit.core.NodeImpl.orderBefore(NodeImpl.java:1815)
at info.magnolia.jcr.wrapper.DelegateNodeWrapper.orderBefore(DelegateNodeWrapper.java:332)
at info.magnolia.jcr.wrapper.DelegateNodeWrapper.orderBefore(DelegateNodeWrapper.java:332)
at info.magnolia.jcr.util.NodeUtil.renameNode(NodeUtil.java:523)
at info.magnolia.templatingkit.migration.util.MigrationUtil.renameAndMergeNodes(MigrationUtil.java:197)
at info.magnolia.templatingkit.migration.util.MigrationUtil.renameAndMergeNodes(MigrationUtil.java:208)
at info.magnolia.migration.task.general.MoveMigrationTask.executeTask(MoveMigrationTask.java:99)