Allow to enumerate/include redirects

[gakada]

E.g., apfilterredir in getPagesInNamespace and getAllPages (Allpages).

For example, getAllPagesInNamespace with all and getRedirectsInNamespace with redirects.

[gakada]

Another thing about redirects is noredirect in move.

[Naleksuh]

So the idea here is that .getAllPages will support whether to include, exclude, or include only redirects? This is good as it currently only allows excluding, annoying.

[gakada]

There is a more general problem, all functions have hard-coded params (with only upload having extraParams), so one can find many issues, like this one, or #133, or not being able to query sha1 (in revisions and image info), etc.