add IPv6 documentation

Author: Elias Nygren

docs/IP-address-mixin.md

@@ -3,7 +3,7 @@
 ```python
 class IPManager():
 	"""
-	Functions for managing IP-addresses. 
+	Functions for managing IP-addresses.
 	Intended to be used as a mixin for CloudManager.
 	"""
 ```
@@ -34,15 +34,15 @@ def get_IPs(self):
 ```
 
 ```python
-def attach_IP(self, server):
+def attach_IP(self, server, family="IPv4"):
 	"""
 	Attach a new (random) IP_address to the given server (object or UUID)
 	"""
-```		
+```
 ```python
 def modify_IP(self, IP_addr, ptr_record):
 	"""
-	Modify an IP address' ptr-record (Reverse DNS). 
+	Modify an IP address' ptr-record (Reverse DNS).
 	Accepts an IP_address instance (object) or its address (string).
 	"""
 ```
@@ -53,4 +53,4 @@ def release_IP(self, IP_addr):
 	Destroy an IP_address. Returns an empty object.
 	Accepts an IP_address instance (object) or its address (string).
 	"""
-```
+```

docs/IP-address.md

@@ -7,12 +7,13 @@
 Attributes:
 	access 		-- "public" or "private"
 	address 	-- the IP address (string)
+    family      -- "IPv4" or "IPv6"
 	ptr_record 	-- the reverse DNS name (string)
 	server 		-- the UUID of the server this IP is attached to (string)
 ```
 
-The only updateable attribute is the `ptr_record`.   
-`ptr_record` and `server` are present only if /server/uuid endpoint was used.
+The only updateable attribute is the `ptr_record`.
+`ptr_record` and `server` are not present if /server/uuid endpoint was used.
 
 ## List / Get
 
@@ -31,13 +32,20 @@ The new IP-address must be attached to a server and has a random address.
 
 ```python
 
-# param: server uuid or a Server object
+# params: server uuid or a Server object and family, for which default is IPv4
 manager.attach_IP(server_uuid)
+manager.attach_IP(server_uuid, "IPv4")
+manager.attach_IP(server_uuid, "IPv6")
 manager.attach_IP(Server)
+manager.attach_IP(Server, "IPv4")
+manager.attach_IP(Server, "IPv6")
+
 
 # or use Server instance
 server = manager.get_server(uuid)
-server.add_IP()
+server.add_IP() # default is IPv4
+server.add_IP("IPv4")
+server.add_IP("IPv6")
 
 ```
 
@@ -60,4 +68,4 @@ ip.save()
 ip = manager.get_IP("185.20.31.125")
 ip.destroy()
 
-```
+```

upcloud/ip_address.py

@@ -32,7 +32,7 @@ def __reset(self, access, address, family="IPv4", ptr_record=None, server=None):
 		self._address = address
 		self._family = family
 
-		# Present when populated from /server/uuid endpoint
+		# Present when not populated from /server/uuid endpoint
 		self._server_uuid = server
 		self.ptr = ptr_record