Add inverted section.

examples/inverted_section/InvertedSection.php

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+<?php
+
+class InvertedSection extends Mustache {
+	public $repo = array();
+}

examples/inverted_section/inverted_section.mustache

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+{{#repo}}<b>{{name}}</b>{{/repo}}
+{{^repo}}No repos :({{/repo}}

examples/inverted_section/inverted_section.txt

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+No repos :(