And ignore irkers by default

https://torrentfreak.com/kat-ph-goes-down-following-domain-issues-switches-to-kickass-to-130613/

The website now requires the id to be prefixed with "--" in the video page url,
to separate it from the optional keywords.

do not raise BrowserIncorrectPassword when the website displays an useless "urgent message" on login

Signed-off-by: Bezleputh <carton_ben@yahoo.fr>

- parse video xml with lxml instead of regexpes
- add a prefix to IDs to know what kind of object it is

Bezleputh authored May 13, 2013 and Romain Bignon committed May 28, 2013

Signed-off-by: Bezleputh <carton_ben@yahoo.fr>
Signed-off-by: Romain Bignon <romain@budget-insight.com>