Added packege support in generator tasks.

```
./skinny g scaffold:jade blog entries entry title:String body:String
```
will generate

src/main/scala/controller/blog/EntriesController.scala
src/main/scala/model/blog/Entry.scala
src/main/webapp/WEB-INF/views/blog/entries/*.jade
src/test/scala/controller/blog/EntriesControllerSpec.scala

```
./skinny g scaffold:jade entries entry title:String body:String
```
will generate

src/main/scala/controller/EntriesController.scala
src/main/scala/model/Entry.scala
src/main/webapp/WEB-INF/views/entries/*.jade
src/test/scala/controller/EntriesControllerSpec.scala