Update to Ch5 and Ch6 to more closely reflect user experiance

Update to Ch5, fixed views import. 

changed 
"from mysite. books.models import Book"
to
"from books.models import Publisher, Author, Book"

When using the original code i was being shown the Django error page with

 "ImportError at /admin/
No module named books.models"

The issue have been documented on StackOverflow at http://stackoverflow.com/questions/15296126/importerror-no-module-named-books-models/16286000#16286000


Update to Ch6, updated an existing image (6-2) to reflect the user experience. admin_index.png showed links to the Books, Publishers and Authors panels when this could not have been possible if the user was following the instructions. This image has been updated.

A copy of 6-2 was inserted later in the document, as "figure 6-7" where it is reflective of the user experience.

All subsequent figure numbers in the document have been updated.

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NOTE: This is my first ever contribution to an OpenSource project, and in fact my first ever fork and pull request on GitHub. I would appreciate any feedback.

Thanks

Brendan