=^_^= This is amazing! Or as GlaDOS would say: continue testing! For science! 

 
 
Updated the Pathfinder:
- Mobs know how to swim.
 
- Idle mobs will prefer to avoid water.
 
- Mobs know how to jump down (up to 3 blocks, like Vanilla)
 
- Mobs' heads and look direction is now better.
 
- General code improvement.
 
Grab the latest version for these updates.
 
 
Keep up the good work! 
I still remember those stupid mobs of MCServer in 2012-2013. Its been a huge improvement since then.
 
Current plan (subject to change):