Merge pull request #21 from hilburn/1.7-update

Zombie Potion Update
Add to todo list
Update gitignore
Poke poke @hilburn, poke poke
Fixing ignores, again
Adding diffusing rate to config
Implement drain rate
Update config description for diffusing rate
Add configs for rate multipliers
Fix formatting/whitespace
Fix mod URL
Remove duplicate event handler
Refactor NotificationHelper --> NotificationHandler
Refactor MixingHelper --> MixingHandler
Refactor PotionRegistryHelper --> PotionRegistryHandler
Move EventHandler
Create registry subfolder
Add helper/handler folders
Move entity AI classes
Move custom potion classes