Merge pull request #19 from raphaelncampos/master

changing to os.environ.get

bot.py

@@ -17,10 +17,10 @@
 
 ###VARIABLES THAT YOU NEED TO SET MANUALLY IF NOT ON HEROKU#####
 try:
-        MESSAGE = os.environ['WELCOME_MESSAGE']
-        TOKEN = os.environ['SLACK_TOKEN']
-        CHANNEL_TOKEN = os.environ['CHANNEL_TOKEN']
-        UNFURL = os.environ['UNFURL_LINKS']
+        MESSAGE = os.environ.get('WELCOME_MESSAGE')
+        TOKEN = os.environ.get('SLACK_TOKEN')
+        CHANNEL_TOKEN = os.environ.get('CHANNEL_TOKEN')
+        UNFURL = os.environ.get('UNFURL_LINKS')
 	RESPONSE_CHANNEL = os.environ.get('RESPONSE_CHANNEL')
         DEBUG_CHANNEL_ID = os.environ.get('DEBUG_CHANNEL_ID', False)
 except:
@@ -116,4 +116,4 @@ def on_open(ws):
     r = start_rtm()
     ws = websocket.WebSocketApp(r, on_message = on_message, on_error = on_error, on_close = on_close)
     #ws.on_open
-    ws.run_forever()
+    ws.run_forever()