Fixed an issue where there clean method for rango.forms.PageForm.clean() would raise an AttributeError
Added a comment to the code explaining the if block in the clean method and correctly de-indented the return statement.
Fix typo stored -> store
Add about link to 4.1.2 template listing

This link "magically appears" in the template listing in section 4.3.
Add missing whitespace
Updated book to reflect @canibanoglu's latest finds in the codebase. Updated the image in Chapter 6 to reflect the new basic categories.
Insert linebreak
Move misplaced `
Insert missing space
Remove 'how to'

Or should it be 'how to use?'
used -> use
thet -> that
Fix bug in hint 10.9.1 resulting in KeyError
Updated Requirements chapter to fix the pip install from textfile command.
Remove redundant likes field in category table schema
Fixed some typos spotted by Rugby
Update setup.rst

added a footnote about finding reusable apps
Update models.rst

changed a footnote to mention South
Update forms.rst

The category() view needs the request and the category_name_url as the parameter, not the category_name.
Updated login.rst to reflect comments by @canibanoglu