Created REST GET message source (markdown)

REST-GET-message-source.md

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+### URI
+
+`GET /mailbox/{name}/{id}/source`
+
+### Params
+
+* `name` - name of the mailbox to list the contents of
+* `id` - identifier of the message to retrieve
+
+### Output
+
+Plain text dump of the message headers and body in SMTP format.
+
+### Example
+
+Request: `curl -i -H "Accept: application/json" http://localhost:9000/mailbox/swaks/20131015T161202-0000/source`
+
+Response:
+
+    HTTP/1.1 200 OK
+    Content-Type: text/plain
+    Content-Length: 264
+    Date: Tue, 15 Oct 2013 23:52:09 GMT
+    
+    Date: Tue, 15 Oct 2013 16:12:02 -0700
+    To: swaks@inbucket.local
+    From: jamehi03@server.com
+    Subject: Swaks Plain Text
+    X-Mailer: swaks v20130209.0 jetmore.org/john/code/swaks/
+    
+    This is a test mailing.
+    
+    This should be clickable: http://google.com/