replaced 02-01_add_entry screnshot

Was showing table Sites before, which no longer there with django 1.6
Also Post has been renamed to Entry
At this stage the we'll see Entrys, as the pluralization has not been implemented yet
replaced 02-02_create_entry screenshot

loggedin as littlepny, table Post is now Entry
replaced 02-03_entry_added screenshot

Logged in user is now littlepony
Post has been renamed to Entry
At this stage we still see Entrys, as the pluralization has not been implemented yet
Update 02-models.rst
Merge branch 'pluralize-entries' into fix-pluralization
Add test and fix for verbose_name_plural