So that requests can be shown and saved if the debug options are activated.
json.load(fp) is just calling json.loads(fp.read) so there is no
performance loss.
Maximum number of revisions in iter_revisions is now 500, the API's limit
for normal users.
webcontentedit has been updated to use the 'count' option for do_log().
The methode iter_revisions(page) is now implemented, and yiels the last
ten revisions of the page, as 'Revision' objects.
Various fixes, like removing unused imports.
