v0.2.2 Gator

• New: Problem solution page support.
• New: Filter for status.
• New: Add user center and settings page.
• New: We now have contest registration.
• New: Introduce professional rating system uses Elo Rating Model.
• New: Introduce casual ranking system and rank page.
• New: NOJ Feed.
• Improved: We now can print problems elegantly.
• Improved: Users can now view their problem status in the problem list page.
• New: EMail Verification.
• Security: Password Minimal Digits are now 8 instead of 6.
  .* New: NOJ Feed.
• Improved: We now supports Google Analytics.
• Improved: We now have Bootstrap Material Design as a package.
• Improved: Down an Online Judge, making it unavailable.