Ns1 provider (#63)

* add ns1 libs to vendor

* Create shim and wire into tests

* ns1 provider more working.

* vendor correct files

* comment diff functions

* ns1 docs

* making mx work with ns1

* ?

* refactor tests to make capability blocks easier. fix up ns1

docs/_providers/ns1.md

@@ -0,0 +1,37 @@
+---
+name: NS1
+layout: default
+jsId: NS1
+---
+# NS1 Provider
+
+NS1 provides a dns provider implementation for ns1 dns.
+
+## Configuration
+
+In your providers config json file you must provide your ns1 api key:
+
+{% highlight json %}
+{
+  "ns1":{
+    "api_token": "your-ns1-token"
+  }
+}
+{% endhighlight %}
+
+## Metadata
+
+This provider does not recognize any special metadata fields unique to ns1.
+
+## Usage
+
+Example javascript:
+
+{% highlight js %}
+var NS1 = NewDnsProvider("ns1", "NS1");
+
+D("example.tld", MY_REGISTRAR, DnsProvider(NS1),
+    A("test","1.2.3.4")
+);
+{% endhighlight %}
+