Misc error fixes

* (mediawiki-open, mediawiki-reload) Prompt for site if one isn't given
* (mediawiki-save-page) actually display errors

mediawiki.el

Bump version

Fix bad token by updating login and refreshing token

both are probably not needed but they do the job.

fixes #7

Documentation changes

Clarify README a bit.
Point to github instead of launchpad.
Update ChangeLog.

Fix LP#604042 — pages were being saved as the anonymous user.

2010-07-02 Mark A. Hershberger <mah@everybody.org>

	* mediawiki.el (url-http-create-request): Work around bug in url.el.
	(mediawiki-edittoken, mediawiki-starttimestamp)
	(mediawiki-basetimestamp): New buffer-local variables to enable
	the API.
	(mediawiki-make-api-url, mediawiki-api-call): New functions to
	enable the API
	(mediawiki-open): Update use of mediawiki-edit
	(mediawiki-edit): Rewrite to use API and make it function
	uniformly for all calls.  Remove dependency on buffer-local
	mediawiki-site.
	(mediawiki-get-form-vars): Simplify + make it handle <input>
	elements without value attributes.
	(mediawiki-save-page): Rewrite to use API.
	(mediawiki-site): Use API.  Remove callbacks aren't used.
	(mediawiki-site-extract): Trigger error for non-existant site.
	(mediawiki-api-param): New utility function for setting parameters
	like the MW API wants.
	(mediawiki-page-get-title): New utility function to extract a
	title from a page in the pagelist structure that the MW API
	returns.
	(mediawiki-page-get-revision): New utility function to extract a
	revision from a the pagelist structure.
	(mediawiki-pagelist-find-page): New utility function to extract
	the entire page structure from a pagelist structure
	(mediawiki-api-query-title): New function. Query the API and get
	the current revision of the page.
	(mediawiki-do-logout, mediawiki-do-login): Use the API.