Readme: Remove jquery-wp-content reference

The footer doesn't contain version numbers anymore and doesn't need
updates during releases.
Readme: Another release instructions updates
Dump: Configurable limit for object depth

In projects with deep object graphs, like Ember, walking all properties
of an an object recursively can end up walking most of memory. This
causes the browser to run out of memory and kill the tab/thread.

This introduces a maxDepth config for the parse function, which is used in
places where strictly accurate output of an object is not needed, for
instance, when showing two un-equal object in test output.

Closes #578
Closes #638
Tests: Extract tests for QUnit.dump into its own file

Also moves two tests that check recursion in deepEqual, which share
helpers with the QUnit.dump tests. Moves those helpers on the test
context to get rid of globals.
Dump: Fix typeof check for setInterval

Fixes #631.
Closes #642.
Perf: Use `Error#stack` without throwing when available

Fixes #636.