Revert "Setting api_version=cloud when Cloud=true (#532)"

This reverts commit b4082eb.

Author: Gonchik Tsymzhitov

README.rst

@@ -38,9 +38,6 @@ Here's a short example of how to create a Confluence page:
 
     print(status)
 
-(Note that for Confluence Cloud, some API calls are different, so you'll 
-want to add cloud=True to the Confluence() connection.)
-
 And here's another example of how to get issues from Jira using JQL Query:
 
 .. code-block:: python

atlassian/rest_client.py

@@ -28,8 +28,6 @@ def __init__(self, url, username=None, password=None, timeout=60, api_root='rest
                 and '/wiki' not in url \
                 and self.__class__.__name__ in 'Confluence':
             url = self.url_joiner(url, '/wiki')
-        if (cloud == True):
-            api_version = 'cloud'
         self.url = url
         self.username = username
         self.password = password