Add mustache spec to tests

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "spec/mustache"]
+	path = spec/mustache
+	url = git@github.com:mustache/spec.git

spec/spec.js

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+describe('spec', function() {
+  // NOP Under non-node environments
+  if (typeof process === 'undefined') {
+    return;
+  }
+
+  var _ = require('underscore'),
+      Handlebars = require('../lib'),
+      fs = require('fs');
+
+  var specDir =__dirname + '/mustache/specs/';
+  var specs = _.filter(fs.readdirSync(specDir), function(name) {
+    return /.*\.json$/.test(name);
+  });
+
+  _.each(specs, function(name) {
+    var spec = require(specDir + name);
+    _.each(spec.tests, function(test) {
+      // Our lambda implementation knowingly deviates from the optional Mustace lambda spec
+      // We also do not support alternative delimeters
+      if (name === '~lambdas.json'
+
+          // We also choose to throw if paritals are not found
+          || (name === 'partials.json' && test.name === 'Failed Lookup')
+
+          // We nest the entire response from partials, not just the literals
+          || (name === 'partials.json' && test.name === 'Standalone Indentation')
+
+          || /\{\{\=/.test(test.template)
+          || _.any(test.partials, function(partial) { return /\{\{\=/.test(partial); })) {
+        it.skip(name + ' - ' + test.name);
+        return;
+      }
+
+      var data = _.clone(test.data);
+      if (data.lambda) {
+        // Blergh
+        data.lambda = eval('(' + data.lambda.js + ')');
+      }
+      it(name + ' - ' + test.name, function() {
+        if (test.partials) {
+          shouldCompileToWithPartials(test.template, [data, {}, test.partials, true], true, test.expected, test.desc + ' "' + test.template + '"');
+        } else {
+          shouldCompileTo(test.template, [data, {}, {}, true], test.expected, test.desc + ' "' + test.template + '"');
+        }
+      });
+    });
+  });
+});