Merge pull request #1155 from carbontwelve-forks/add-ext-intl-dep

Add ext-intl requirement

composer.json

@@ -9,6 +9,7 @@
         "ext-bcmath": "*",
         "ext-ctype": "*",
         "ext-curl": "*",
+        "ext-intl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
         "ext-openssl": "*",