Close #3886 - Add THEAD and TBODY to scaffold markup

Change check_box to work inverting the checked and unchecked value

This fixes:

* Boolean with inverted logic
* Integer with inverted logic
* BigDecimal with inverted logic

Fixes #3995

Partial layout collection item

Removed the sanitize_dom_id method

Layout is never an available option when rendering with the shortcut
`render @collection`.

Allow access to current object_counter variable from layout when rendering with partial + collection

Removed extraneous .present? check for AR::Base#reload

Removed deprecation warning for #find as a result of AR::Base#reload

Cleaned up "DEPRECATION WARNING: Passing options to #find is
deprecated. Please build a scope and then call #find on it."

Add changelog entry for jsonp mimetype change, fix failing test

Fix failing test: Mime::JS generates "text/javascript"

The range example used in array conditions is unclear and talks about
the old 'conditions' option. Closes #4943.

Tests for regexp separator in String#truncate

https://github.com/rails/rails/commit/5a7513593f64e0ff7e4de1ee37bac5eeddfae270

Add a "silence" behavior to completely turn off deprecation warnings.

JSONP should use mimetype application/javascript

closes #3341

Active Support housekeeping and polish

https://github.com/rails/rails/commit/e7d55f734aae204115d0a04a2db774ac364c1312