Namecheap take Provider (#202)

* re-copying namecheap dns provider and testing

* document limits. mx broken because super odd api

* manually path namecheap lib. passing tests.

* generate

* generate

* clarify limit

* conflict

* add dependency

* fully document namecheap capabilities

providers/capabilities.go

@@ -44,9 +44,10 @@ func ProviderHasCabability(pType string, cap Capability) bool {
 
 // DocumentationNote is a way for providers to give more detail about what features they support.
 type DocumentationNote struct {
-	HasFeature bool
-	Comment    string
-	Link       string
+	HasFeature    bool
+	Unimplemented bool
+	Comment       string
+	Link          string
 }
 
 // DocumentationNotes is a full list of notes for a single provider
@@ -100,6 +101,17 @@ func Cannot(comments ...string) *DocumentationNote {
 	return n
 }
 
+// Unimplemented is a small helper for concisely creating Documentation Notes
+// comments are variadic for easy ommission. First is comment, second is link, the rest are ignored.
+func Unimplemented(comments ...string) *DocumentationNote {
+	n := &DocumentationNote{
+		HasFeature:    false,
+		Unimplemented: true,
+	}
+	n.addStrings(comments)
+	return n
+}
+
 func (n *DocumentationNote) addStrings(comments []string) {
 	if len(comments) > 0 {
 		n.Comment = comments[0]