edx/edx-platform — pull request #4195 by asadiqbal08 (2014-06-24 11:36:49+00:00)
Title: (WIP) updating migration for student and shopping cart apps

@cdodge, Here i have deleted some migration files related to lms shopping cart models. and modified the existing one, In these two migration files we have max_length = 255.
you should run the backward migration or delete the entries from south migration table.
Kindly let me know are these changes OK for you ?