Add events.js to /resources/ and update script reference in key* entries

Closes #208
Update categories.xml to include jQuery version  1.9
.css(): Add new signature for 1.9
Removing <em> tags from example code on live() entry - Closes gh-165
Mark .toggle() event as deprecated in 1.8
jQuery.contains(): Clarify language.

Closes #213
Add .finish() entry for jQuery 1.9
.addClass(): Trivial cleanup.
:checked selector: Clean up examples
Add entry for jQuery.parseHTML()
Add deprecation notices for error load, unload events
Add entry for $.parseHTML
Merge branch 'master' into jquery-1.9

* master:
  Add entry for $.parseHTML
  Add deprecation notices for error load, unload events
  Add entry for jQuery.parseHTML()
  :checked selector: Clean up examples
  .addClass(): Trivial cleanup.
  jQuery.contains(): Clarify language.
  Mark .toggle() event as deprecated in 1.8
  Removing <em> tags from example code on live() entry - Closes gh-165
Change "looks like HTML" text and add reference to $.parseHTML()

Closes #220
Add a few new (as of 1.9 selectors)
Mark 1.9 removed methods as removed.
Clean up deprecated/removed flags. Add flags to .toggle(fn, fn) and .die()
Fix href to jQuery 1.9 release notes
Update entries/finish.xml
Add remaining new selectors for jQuery 1.9.

Closes #219