edx/edx-platform — pull request #1291 by polesye (2013-10-10 07:41:10+00:00)
Title: LTI: Remove adding prefix to custom parameters.

This PR provide fix for BLD-405.
Prefix 'custom_' is removed that was prepended before each custom parameter.

@Lyla-Fischer, @auraz, @valera-rozuvan Please review.