Added concrete targets in Podfile to work with Cocoapods 1.0.0 onwards.

[mjjimenez]

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This fixes the error:

[!] The dependency `SlackTextViewController (from `../SlackTextViewController.podspec`)` is not used in any concrete target.
The dependency `LoremIpsum (~> 1.0)` is not used in any concrete target.

when doing pod install in the "Examples" folder using Cocoapods version 1.0 onwards.

[cardoso]

Thanks.

This should've been merged :/

[dzenbot]

Thanks for updating it!