Added a route to get all tasks sorted desc by their due dates (#14)

REST-Tests/auth.http

@@ -4,7 +4,7 @@ Content-Type: application/json
 
 {
   "username": "user",
-  "password": "1234"
+  "password": "12345"
 }
 
 > {% client.global.set("auth_token", response.body.token); %}

REST-Tests/lists.http

@@ -98,4 +98,10 @@ Content-Type: application/json
 DELETE http://localhost:8080/api/v1/lists/28/users/3
 Authorization: Bearer {{auth_token}}
 
+###
+
+# Get all pending tasks
+GET http://localhost:8080/api/v1/tasks
+Authorization: Bearer {{auth_token}}
+
 ###