dependency updates
dependency updates

```
 tmp       ^0.0.28  →  ^0.0.31
 request   ^2.72.0  →  ^2.79.0
 istanbul   ^0.4.3  →   ^0.4.5
 jshint     ^2.9.2  →   ^2.9.4
 tape       ^4.5.1  →   ^4.6.3
```

uber/canduit