Add realtime observation parsing and testing.

siphon/tests/fixtures/ndbc_realtime_rain

@@ -0,0 +1,86 @@
+interactions:
+- request:
+    body: null
+    headers:
+      Accept: ['*/*']
+      Accept-Encoding: ['gzip, deflate']
+      Connection: [keep-alive]
+      User-Agent: [Siphon (0.7.0+38.g5e7b937.dirty)]
+    method: GET
+    uri: https://www.ndbc.noaa.gov/data/realtime2/BDVF1.rain
+  response:
+    body:
+      string: !!binary |
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+    headers:
+      Accept-Ranges: [bytes]
+      Cache-Control: [must-revalidate]
+      Connection: [close]
+      Content-Encoding: [gzip]
+      Content-Length: ['3083']
+      Content-Security-Policy: [frame-ancestors 'self']
+      Content-Type: [text/plain; charset=ISO-8859-1]
+      Date: ['Wed, 01 Aug 2018 15:29:47 GMT']
+      Last-Modified: ['Wed, 01 Aug 2018 14:51:27 GMT']
+      Server: [Apache]
+      Strict-Transport-Security: [max-age=31536000;]
+      Vary: [Accept-Encoding]
+      X-Content-Type-Options: [nosniff]
+      X-Frame-Options: [SAMEORIGIN]
+      X-XSS-Protection: [1; mode=block]
+    status: {code: 200, message: OK}
+version: 1