daapclient plugin does not play songs from IPv6 servers

Exaile 0.3.1.1
installed from Ubuntu Repositories

Expected Behaviour:
Songs on IPv6 connected DAAP servers should be playable

Actual Behaviour:
Trying to play songs on IPv6 connected DAAP servers results in an error message about an invalid URI

Problem:
The IPv6 IP needs to be escaped with [] within an URI. It is not.

e.g.:
* Class DaapConnection is instantiated

* self.server == "2a20:abcd:abcd:2::10"
* self.port == 3691

then in "DaapConnection.convert_list" on the following statement
* uri = "http://%s:%s/databases/%s/items/%s.%s?session-id=%s" % \
                    (server_uri, self.port, self.database.id, tr.id,
                    tr.type, self.session.sessionid)

the result will be
uri == "http://2a02:3e0:2002:1::1:3691/databases/....

Which will _never_ work, because now the port and ip can't be differentiated.

Instead a correct URI would look like this:
http://[2a02:3e0:2002:1::1]:3691/databases/...

Suggestion for a trivial fix follows:

[..]
+ server_uri = self.server
+ if ":" in server_uri:
+ # is IPv6 IP -> add [] for uri
+ server_uri = "[" + server_uri + "]"
[...]
                uri = "http://%s:%s/databases/%s/items/%s.%s?session-id=%s" % \
- (self.server, self.port, self.database.id, tr.id,
+ (server_uri, self.port, self.database.id, tr.id,
                    tr.type, self.session.sessionid)