[MERGE] HTTP redirection

[Aaron Bentley]

Aaron Bentley wrote:
> Vincent Ladeuil wrote:
>> After discussions with Robert at NlSprint, John on IRC and Robert
>> again on IRC, here is a new attempt at http redirections.
> 
> I think this is very close to mergeable.
> 
>> - By default http do not redirect silently but instead raise the
>>   RedirectedRequest exception,
> 
> I'm a little sad to see that removed, because I use transports elsewhere
> (e.g. 'bzr patch' from bzrtools) and I'll have to manually handle
> redirects now.

Also, we should make sure that reading a bundle from a URL still follows 
redirects properly.  And anywhere else we use transports.

Aaron