Fixed 'control may reach end of non void function' warning

It seems like the default compiler setting in Xcode 5 starts treating this warning as an error and fails the compilations of the library.

http://stackoverflow.com/questions/18908129/xcode-5-what-was-a-warning-now-an-error-control-may-reach-end-of-non-void-func

Experienced using version 0.0.6 as a pod dependency. Cocoapods version 0.26.2.