Removed broken rake tasks
Removed broken rake tasks

These tasks were broken by a previous commit (f959e2e). Given that no one has complained in over a month, I am removing them.

edx-solutions/cs_comments_service,edx/cs_comments_service,edx/cs_comments_service,Stanford-Online/cs_comments_service,edx/cs_comments_service,Stanford-Online/cs_comments_service,edx-solutions/cs_comments_service,EDUlib/cs_comments_service,EDUlib/cs_comments_service,edx-solutions/cs_comments_service,EDUlib/cs_comments_service,Stanford-Online/cs_comments_service