Implement get_all_teams() to return all teams (#12)

* Implement get_all_teams() to return all teams

I think this should work based on what we talked about in Slack, but it is untested so if you have a dev environment - it's worth running it through that first. Also, feel free to adjust the copy I added to the `get_teams()` method talking about `get_all_teams()`.

* Fixed endpoint and copy.

Author: jhodges10

frameioclient/client.py

@@ -32,14 +32,25 @@ def get_me(self):
 
   def get_teams(self, account_id):
     """
-    Get teams owned by the account.
-
+    Get teams owned by the account. 
+    (To return all teams, use get_all_teams())
+    
     :Args:
       account_id (string): The account id.
     """
     endpoint = '/accounts/{}/teams'.format(account_id)
     return self._api_call('get', endpoint)
 
+  def get_all_teams(self):
+    """
+    Get all teams for the authenticated user.
+
+    :Args:
+      account_id (string): The account id.
+    """
+    endpoint = '/teams'
+    return self._api_call('get', endpoint)
+
   def get_projects(self, team_id):
     """
     Get projects owned by the team.