[Mediawiki-api] API updates

[Yuri Astrakhan]

A few recent changes, hope it was in time for MediaWiki 1.11 release:

* list=logevents updated - more event type decoding, leprop= allows to
specify exactly what data is needed. log_id is now exposed. Some
result might be different than before. This list needs some feedback
and  attention.

* userCanRead() has been removed everywhere - now API will work for
the users that have read permissions for the entire wiki  (see
$wgGroupPermissions variable settings at
http://www.mediawiki.org/wiki/Manual:$wgGroupPermissions ).
userCanRead() will still be called when requesting page content.

* API no longer checks for the maximum upper limit restrictions when
calling api internally

* rc_id is exposed in list=recentchanges requests

--Yuri