Allow DELETE requests to have a content body, and properly serialize data to the url for HEAD requests. Fixes #7285.

Moved jQuery.props to attributes since it was only used in support. Fixes #6897 - suggestion by dmethvin

Make sure that .width()/.height() don't return NaN also standardize on returning  instead of auto for default values (which is what we do elsewhere in .css() as well). Fixes #7225.

Make sure that +, >, ~ leading, rooted, selectors go to the old engine. Thanks to @rkatic for the catch! Fixes #7220.

Forces lower case comparison of protocol and host when determining whether the request is remote or local. Fixes #6908

Followup to commit 97dfa0d5 which
had the side effect to break some attribute unit tests

Add some more tests to make sure that pulling in data- properties on an element with no data set, works.

Make sure that .data() (no args) returns a list of all the data- properties as well. Also make sure that accessing a data- property via .data() doesn't cause it to change again at a later time (it should be static). Fixes #7222, #7223.

We removed deleteExpando after 1.4.2, for some reason. This caused problems with removeData() (no arguments). Fixes #7209.

Handle the case where JSLint complains about arguments in try/catch already being defined (we use the name 'e' consistently for catch(e) - will work to standardize on that now).

Bringing back the change from 80a4178a, adapted to handle both the function collision and the issue mentioned in #7196.

Getting weird results for font size tests across platforms - easier to test something else (the exact property isn't important for this test).