v0.4.0 Piranha

• New: Grouped Message.
• New: Now php artisan down supports custom message.
• New: Submission Error resubmit inside contest.
• New: babel update & babel install support for Admin Portal.
• New: Users can now leave a group.
• New: NOJ Dojo support.
• New: Report Abuse support.
• Fixed: Error occured when trying to enter non-exist groups.
• Fixed: Group Abuse message leader name display bugs.
• Fixed: MDI display error.
• Fixed: ProblemModel file_url no longer requirable.
• Fixed: Notification while leader leaving the group.
• Fixed: Accpet invitation display.
• Fixed: GitHub Login.
• Fixed: Double Footer.
• Fixed: MarkerPen Issues.
• Improved: NOJ now use Eloquent for all New Models.
• Improved: Error Page.
• Improved: NOJ Standalone Queue.
• Improved: Problem now supports order .
• Improved: babel crawl now supports from option.