Updating the API doc for 'throws'

Removing the String comparison option.
Adding the Error instance comparison option.
Adding the callback comparison option.

Related to jquery/qunit#547.
Related to jquery/qunit#579.
Related to jquery/qunit#593.
1.14.6
Entries: Fix assert's type

Fixes #55
1.14.7
Entries: Add reference to assertion methods for test() and asyncTest()

Fixes #55
Closes #57
1.14.8
Build: Update license

Closes gh-52
Entries: Deprecate QUnit.init

Ref: jquery/qunit#530
1.14.9
Entries: Fix typo in deprecated messages
1.14.10
QUnit.config: Fix typo and grammar error

Closes #60
Build: Upgrade to grunt-jquery-content 0.12.0
1.14.11
Assert: Message argument is optional
1.15.0
Entries: Document the rename from QUnit.jsDump to QUnit.dump

Adds a note about the old name and fixes the entrie's type property.