Modified sample_sms.txt to be subbed into in a sane way. Added ability to set context, due date, and show_from date from within an emailed message.

test/fixtures/contexts.yml

@@ -122,3 +122,12 @@ inbox:
   user_id: 4
   created_at: <%= today %>
   updated_at: <%= today %>
+
+anothercontext:
+  id: 14
+  name: anothercontext
+  position: 2
+  hide: false
+  user_id: 4
+  created_at: <%= today %>
+  updated_at: <%= today %>

test/fixtures/sample_sms.txt

@@ -9,4 +9,4 @@ Content-Type: text/plain;charset=utf-8
 Content-Transfer-Encoding: 7bit
 Importance: Normal
 
-This is a todo 4112093
+message_content