contrib_bots: Restructure bots to follow a consistent structure.

Now all the bots that are stored in contrib_bots are in the
same file/directory format.
The format is specified here #3427. Add tests.py file for encrypt_bot as well.
Fixes #3427.

contrib_bots/bots/yoda_bot/readme.md

@@ -17,7 +17,7 @@ Go to this link:
 This is the API that powers the `yoda_bot`. You can read more about it
 on this page.
 
-![yoda api overview](yoda-speak-api.png)
+![yoda api overview](assets/yoda-speak-api.png)
 
 Click on the **Sign Up Free** button at the top and create
 an account. Then click on the **Documentation** tab. Scroll down to the
@@ -29,9 +29,9 @@ the Yoda Speak API to. Click on the blue **GET THE KEYS** button.
 
 On the pop-up that comes up, click on the **COPY** button.
 This is your Mashape API Key. It is used
-to authenticate. Store it in the `yoda_api_key.txt` file.
+to authenticate. Store it in the `yoda_bot.config` file.
 
-The `yoda_api_key.txt` file should be located at `~/yoda_api_key.txt`.
+The `yoda_bot.config` file should be located at `~/yoda_bot.config`.
 
 Example input:
 

contrib_bots/bots/yoda_bot/yoda_bot.py

@@ -1,4 +1,4 @@
-# See readme-yoda-bot.md for instructions on running this code.
+# See readme.md for instructions on running this code.
 
 from __future__ import print_function
 import os
@@ -17,9 +17,9 @@ HELP_MESSAGE = '''
             Users should preface messages with '@yoda'.
 
             Before running this, make sure to get a Mashape Api token.
-            Instructions are in the 'readme-yoda-bot.md' file.
-            Store it in the 'yoda_api_key.txt' file.
-            The 'yoda_api_key.txt' file should be located at '~/yoda_api_key.txt'.
+            Instructions are in the 'readme.md' file.
+            Store it in the 'yoda_bot.config' file.
+            The 'yoda_bot.config' file should be located at '~/yoda_bot.config'.
             Example input:
             @yoda You will learn how to speak like me someday.
             '''
@@ -42,9 +42,9 @@ class YodaSpeakHandler(object):
             Users should preface messages with '@yoda'.
 
             Before running this, make sure to get a Mashape Api token.
-            Instructions are in the 'readme-yoda-bot.md' file.
-            Store it in the 'yoda_api_key.txt' file.
-            The 'yoda_api_key.txt' file should be located at '~/yoda_api_key.txt'.
+            Instructions are in the 'readme.md' file.
+            Store it in the 'yoda_bot.config' file.
+            The 'yoda_bot.config' file should be located at '~/yoda_bot.config'.
             Example input:
             @yoda You will learn how to speak like me someday.
             '''
@@ -85,7 +85,7 @@ def send_to_yoda_api(sentence, api_key):
         logging.error(error_message)
         error_code = response.status_code
         error_message = error_message + 'Error code: ' + error_code +\
-            ' Did you follow the instructions in the `readme-yoda-bot.md` file?'
+            ' Did you follow the instructions in the `readme.md` file?'
         return error_message
 
 
@@ -115,7 +115,7 @@ def handle_input(client, original_content, stream, subject):
 
         except ApiKeyError:
             reply_message = 'Invalid Api Key. Did you follow the instructions in the ' \
-                            '`readme-yoda-bot.md` file?'
+                            '`readme.md` file?'
             logging.error(reply_message)
 
         send_message(client, reply_message, stream, subject)
@@ -124,7 +124,7 @@ def handle_input(client, original_content, stream, subject):
 def get_api_key():
     # function for getting Mashape api key
     home = os.path.expanduser('~')
-    with open(home + '/yoda_api_key.txt') as api_key_file:
+    with open(home + '/yoda_bot.config') as api_key_file:
         api_key = api_key_file.read().strip()
     return api_key