Added the podspec

**Reference:** issue #3

Generated a test project using the pod locally from the drive.

![screen shot 2014-08-18 at 1 44 05 pm](https://cloud.githubusercontent.com/assets/1492648/3950402/b98ac872-26c4-11e4-9185-280c716d7b59.png)

```
⇒ pod trunk push SaltEdge-iOS.podspec 
Validating podspec
 -> SaltEdge-iOS (1.0.0)

  - Data URL: https://raw.githubusercontent.com/CocoaPods/Specs/3f8c7845b8107a41dc2b2a4002e1a63f732078e3/Specs/SaltEdge-iOS/1.0.0/SaltEdge-iOS.podspec.json
  - Log messages:
    - August 18th, 14:07: Push for `SaltEdge-iOS 1.0.0' initiated.
    - August 18th, 14:07: Push for `SaltEdge-iOS 1.0.0' has been pushed (1.113281935 s).
```

[The commit on CocoaPods Specs repo](https://github.com/CocoaPods/Specs/commit/3f8c7845b8107a41dc2b2a4002e1a63f732078e3).