Remove not used myblog_test_fixture.json
Create a customized PostAdmin and CategoryInline

- item 1,2,3 completed
Suppress the display of the 'posts' in Category admin view
Completed the baseline homework and add homework_description.txt
Option 1: Change the admin index to say 'Categories' instead of 'Categorys'
Option 2: Add columns for the date fields to the list display of Posts
Option 3: Display the created and modified dates for posts when viewing them in
  the admin
Option 4: Add a column to the list display of Posts that shows the author