Add TLSA record support (#165) (#203)

docs/_functions/domain/TLSA.md

@@ -0,0 +1,27 @@
+---
+name: TLSA
+parameters:
+  - name
+  - usage
+  - selector
+  - type
+  - certificate
+  - modifiers...
+---
+
+TLSA adds a TLSA record to a domain. The name should be the relative label for the record.
+
+Usage, selector, and type are ints.
+
+Certificate is a hex string.
+
+{% include startExample.html %}
+{% highlight js %}
+
+D("example.com", REGISTRAR, DnsProvider("GCLOUD"),
+  // Create TLSA record for certificate used on TCP port 443
+  TLSA("_443._tcp", 3, 1, 1, "abcdef0"),
+);
+
+{%endhighlight%}
+{% include endExample.html %}