since the method does not edit the page, but returns the text of the
page. The old method name still works, but issues a DeprecationWarning.
Note that DeprecationWarnings are silent by default, so we might
consider to elevate it in some future version.

Semantic linebreaks: http://rhodesmill.org/brandon/2012/one-sentence-per-line/

* Raise an ApiDisabledError if the API is disabled
* Properly fail on HTTPS sites