Simplify getting name of email / sms providers

Previously we used a combination of "provider.name" and "get_name()"
which was confusing. Using a non-property function also gave me the
impression that the name was more dynamic than it actually is.

app/clients/email/__init__.py

@@ -28,5 +28,6 @@ class EmailClient(Client):
     def send_email(self, *args, **kwargs):
         raise NotImplementedError('TODO Need to implement.')
 
-    def get_name(self):
+    @property
+    def name(self):
         raise NotImplementedError('TODO Need to implement.')

app/clients/email/aws_ses.py

@@ -59,11 +59,11 @@ class AwsSesClient(EmailClient):
     def init_app(self, region, statsd_client, *args, **kwargs):
         self._client = boto3.client('ses', region_name=region)
         super(AwsSesClient, self).__init__(*args, **kwargs)
-        self.name = 'ses'
         self.statsd_client = statsd_client
 
-    def get_name(self):
-        return self.name
+    @property
+    def name(self):
+        return 'ses'
 
     def send_email(self,
                    source,

app/clients/email/aws_ses_stub.py

@@ -13,12 +13,12 @@ class AwsSesStubClientException(EmailClientException):
 
 class AwsSesStubClient(EmailClient):
     def init_app(self, region, statsd_client, stub_url):
-        self.name = 'ses'
         self.statsd_client = statsd_client
         self.url = stub_url
 
-    def get_name(self):
-        return self.name
+    @property
+    def name(self):
+        return 'ses'
 
     def send_email(self,
                    source,