Linting (#647)

* linting
* Fix adding-new-rtypes.md to include validation
* BIND: improve docs wrt SOA records, get-zones

docs/_providers/bind.md

@@ -46,7 +46,16 @@ var BIND = NewDnsProvider('bind', 'BIND', {
 })
 {% endhighlight %}
 
-## SOA Records
+# FYI: get-zones
+
+When used with "get-zones", specifying "all" scans the directory for
+any files named `*.zone` and assumes they are zone files.
+
+```
+dnscontrol get-zones --format=nameonly - BIND all
+```
+
+# FYI: SOA Records
 
 DNSControl assumes that SOA records are managed by the provider.  Most
 providers simply generate the SOA record for you and do not permit you

docs/adding-new-rtypes.md

@@ -53,6 +53,11 @@ a minimum.
 * Add the capability to the file `dnscontrol/providers/capabilities.go` (look for `CanUseAlias` and add
 it to the end of the list.)
 * Add this feature to the feature matrix in `dnscontrol/build/generate/featureMatrix.go` (Add it to the variable `matrix` then add it later in the file with a `setCap()` statement.
+* Add the capability to the list of features that zones are validated
+  against (i.e. if you want dnscontrol to report an error if this
+  feature is used with a DNS provider that doesn't support it). That's
+  in the `checkProviderCapabilities` function in
+  `pkg/normalize/validate.go`.
 * Mark the `bind` provider as supporting this record type by updating `dnscontrol/providers/bind/bindProvider.go` (look for `providers.CanUse` and you'll see what to do).
 
 ## Step 3: Add a helper function

providers/hexonet/records.go

@@ -36,7 +36,7 @@ type HXRecord struct {
 }
 
 // GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
-func (client *HXClient) GetZoneRecords(domain string) (models.Records, error) {
+func (n *HXClient) GetZoneRecords(domain string) (models.Records, error) {
 	return nil, fmt.Errorf("not implemented")
 	// This enables the get-zones subcommand.
 	// Implement this by extracting the code from GetDomainCorrections into