Merge commit 'c19e58c8' (spec-compliant)

Adds spec tests.

.gitmodules

+[submodule "ext/spec"]
+	path = ext/spec
+	url = http://github.com/mustache/spec.git

spec @ 62871926

+Subproject commit 62871926ab5789ab6c55f5a1deda359ba5f7b2fa

tests/test_spec.py

+import glob
+import os.path
+import pystache
+import unittest
+import yaml
+
+def code_constructor(loader, node):
+    value = loader.construct_mapping(node)
+    return eval(value['python'], {})
+
+yaml.add_constructor(u'!code', code_constructor)
+
+specs = os.path.join(os.path.dirname(__file__), '..', 'ext', 'spec', 'specs')
+specs = glob.glob(os.path.join(specs, '*.yml'))
+
+class MustacheSpec(unittest.TestCase):
+    pass
+
+def buildTest(testData, spec):
+    def test(self):
+        template = testData['template']
+        partials = testData.has_key('partials') and test['partials'] or {}
+        expected = testData['expected']
+        data     = testData['data']
+        self.assertEquals(pystache.render(template, data), expected)
+
+    test.__doc__  = testData['desc']
+    test.__name__ = 'test %s (%s)' % (testData['name'], spec)
+    return test
+
+for spec in specs:
+    name  = os.path.basename(spec).replace('.yml', '')
+
+    for test in yaml.load(open(spec))['tests']:
+        test = buildTest(test, name)
+        setattr(MustacheSpec, test.__name__, test)
+
+if __name__ == '__main__':
+    unittest.main()