iPeer v3.1.1 is released

This is a maintenance release. It fixes the following bugs:

• Fix mixeval scale was incorrect rendered when upgrade 3.1
• Modified build script to run in Vagrant and Ticket #548
• Fix #557, filters are failed on lists on dreamhost
• Fix #542
• Update guard plugin
• Catch the exception with more information printed
• Fix mixeval result rendering error
• Fix #558, 404 when student submitting evaluation
• Refactor mixeval to use unified preview
• Refactor rubric form to show header in view page
• Fix #555, merge user search failed when installed on subdirectory
• Fix #554, confirm button on upgrade page on firefox
• Fix #556, use relative URL for css background image
• Fix #543 remove the criteria hint text from rubric
• Remove the orphan entries in mixeval_question_descs
• Fix missing Content-length in response of API call
• Fix API return 404 when no department is setup
• Fixed problem with exporting evaluation results to csv
• Fixed the inability to view students' survey

For the upgrade, please refer to the Upgrade page.

Related Tickets: TicketQuery(milestone=V3.1.1&resolution=fixed)