Envia emails minicursos

Envia email de notificação para os usuários inscritos em minicursos

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![captura de tela de 2014-08-18 14 24 13](https://cloud.githubusercontent.com/assets/44905/3955395/40362fba-2701-11e4-99ab-c67890370bed.png)
![captura de tela de 2014-08-18 13 55 23](https://cloud.githubusercontent.com/assets/44905/3955398/40530f7c-2701-11e4-97a9-2f4a91e9022c.png)