Set Jade's compileDebug flag to false

Setting the `compileDebug` flag to `false` prevents compiling debug instrumentation which makes template inline code unnecessarily complicated in some cases.

For example the following will not work with `compileDebug` set to `true` (default)
```
- var array = ['first',
-   ...
-   'last'];
```
because each line will be interspersed with line number assignment used for debugging purposes.