Modularize  ReactHelmet component

Originally reported by: **Hardik Modha (Bitbucket: [HardikModha](https://bitbucket.org/HardikModha), GitHub: [HardikModha](https://github.com/HardikModha))**

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Move ReactHelmet component from causecode-react and modularize it.

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- Bitbucket: https://bitbucket.org/causecode/react-hero/issue/16
