Fixed bake Plugin.Classname to use Classname as the class name

When I run
```sh
    ./Console/cake bake model Books.Book
```
I get several errors pertaining to the table books.book

when i run 
```sh
    ./Console/cake bake model Book
```
everything works as expected.

when i run 
```sh
    ./Console/cake bake helper Books.Book
```
cake creates `Plugin/Books/View/Helper/Books.BookHelper.php`

I added the fix to the SimpleBakeTask.php and ModelTask.php but I think it might be better to go up a level. BakeTask::main() might be a better place to put the fix but it currently does not take in a parameter or return one. I am open to thoughts and suggestions.