Merge pull request #1 from jittat/master

Merge pull request from origin.
Implement list_all action for message console
Update rails version to '3.2.19' to compensate with issue stated by nattee on pull request #4 of cafe-grader-judge-scripts, add view of list_all action
Merge pull request #4 from sarunint/master

Implement list_all action for message console and update rails version.