Used sweet-alert for delete confirmation

![screen shot 2014-10-11 at 01 41 41](https://cloud.githubusercontent.com/assets/47926/4599591/49a79b92-50c8-11e4-8f2f-39e633d40451.png)
![screen shot 2014-10-11 at 01 46 30](https://cloud.githubusercontent.com/assets/47926/4599594/4f807584-50c8-11e4-950d-7e8d8dae9a69.png)
![screen shot 2014-10-11 at 01 52 29](https://cloud.githubusercontent.com/assets/47926/4599595/52f4fe60-50c8-11e4-85d6-efc08afa2108.png)

If you don't import it as `(less)` in the generated css it will be as import.. check the generated CSS

it should be

```
@import (less) "../../ext/less/sweetalert/sweet-alert.css";
```

More here: http://lesscss.org/features/#import-directives-feature-file-extensions