make toggle(true/fales) and toggleClass("...", true/false) shortcut to show/hide and add/removeClass

The .toggle methods both construct new jQuery objects for each element to test the current state, but in the case where a boolean is passed this isn't needed.

This change avoids the new jQuery objects for cases where a boolean is passed to the toggle methods.

It adds a few bytes in its current state, and adds an extra code path, but it also simplifies the loops a bit since the boolean case no longer goes into the loops. This will also remove a closure from .toggle() and will pass all the elements at once to showHide() which minimizes reflow when you pass multiple elements.

  raw     gz Compared to master
  +122    +16 dist/jquery.js
   +50     +3 dist/jquery.min.js

The +3 can probably be removed.  For example, inlining the "var type = typeof value" actually makes it smaller but then does a typeof within the .each (which might be fine..?):

 raw     gz Compared to master
  +121     +6 dist/jquery.js
   +60     -3 dist/jquery.min.js