adds rest api connector

- routing setup with path to message_controller
- messages api to database updated to function
  similar to a stack system (push, pop, peek, ..)
- rest calls the same as database calls
- setup default controller showing text message
- parsing database output with Jason to client
- adds curl examples

lib/bump/messages.ex

@@ -3,39 +3,56 @@ defmodule Bump.Messages do
   alias Bump.Messages.Message
   import Ecto.Query
 
-  def get_newest_message(sender) do
+  def pop(sender) do
     query = from m in "messages",
             where: m.sender == ^sender,
             order_by: [desc: m.timestamp],
             limit: 1,
-            select: m.data
+            select: %{id: m.id, data: m.data, timestamp: m.timestamp}
+
+    res = Repo.one(query)
+
+    if not is_nil(res) do
+      Repo.delete_all(from m in "messages", where: m.id == ^res.id)
+    %{data: res.data, timestamp: res.timestamp}
+    else
+      nil
+    end
+
+  end
+
+  def peak(sender) do
+    query = from m in "messages",
+            where: m.sender == ^sender,
+            order_by: [desc: m.timestamp],
+            limit: 1,
+            select: %{data: m.data, timestamp: m.timestamp}
     Repo.one(query)
   end
 
-  def get_all_messages_since(sender, minutes) do
+  def list(sender, minutes) do
 
     ago = DateTime.utc_now 
           |> Timex.shift(minutes: -minutes) 
           |> DateTime.truncate(:second)
 
     query = from m in "messages",
-      where: m.sender == ^sender and
-             m.timestamp >= ^ago,
-      select: m.data
+            where: m.sender == ^sender and
+            m.timestamp >= ^ago,
+            select: %{data: m.data, timestamp: m.timestamp}
+
     Repo.all(query)
   end
 
-  def remove_sender(sender) do
+  def clear(sender) do
     query = from m in "messages",
-      where: m.sender == ^sender,
-      select: m.id
+            where: m.sender == ^sender
+
     Repo.delete_all(query)
   end
 
-  def add_message(sender, message) do
-    time = 
-      DateTime.utc_now 
-      |> DateTime.truncate(:second)
+  def push(sender, message) do
+    time = DateTime.utc_now |> DateTime.truncate(:second)
 
     Repo.insert(%Message{sender: sender, data: message, timestamp: time})