Merge pull request kiwi-bdd#629 from kiwi-bdd/release/2.4.0

Bump to 2.4.0

update podspec to 2.3.1

update podspec for 2.3.0

Merge pull request kiwi-bdd#477 from modocache/revert-pull-request-427

Revert pull request kiwi-bdd#427.

Merge pull request kiwi-bdd#397 from cristiankocza/id-as-default-retu…

…rn-type

Using the objective-c default return type id instead of void for stubbed methods

Merge pull request kiwi-bdd#329 from allending/fix-nil-matcher

Report failures for tested nil subjects properly

updated podspec to 2.2

simplified