Redesign bootswatch flatly

I did a redesign of the interface using Flatly, a Bootswatch 3 theme
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![login](https://cloud.githubusercontent.com/assets/1464035/3643505/507d2722-10d4-11e4-8401-60c93bc7159f.png)

![home](https://cloud.githubusercontent.com/assets/1464035/3643504/507ce906-10d4-11e4-9b8b-b4c534cfa4d4.png)

![collection](https://cloud.githubusercontent.com/assets/1464035/3643502/507c68be-10d4-11e4-8576-337149f60f26.png)
![document](https://clo
ud.githubusercontent.com/assets/1464035/3643503/507c75e8-10d4-11e4-8440-3f7839a9b109.png)