Even bugs need updates

• Fixed polar bears and shulkers (closes #110)
• Fixed 'update to pre-releases' error (closes #176)
• Fixed villager spawn bug (closes #174)
• Fixed Grief Preventation admin regions throwing errors when trying to get owners of them (closes #188)
• Fixed cursor item deletion... I guess? (thanks @Sharpjaws)
• Fixed click actions not working (closes #173)
• Updated aliases, thus fixing some buges (closes #186)
• Added suppport for multiple strings in replace effect (thanks @TheLimeGlass)
• Added way to get unix timestamp (closes #147)
• Added support for inventory name (closes #123)
• Added support for crops (wheat, potations, carrots, etc.) to grow event
• Removed 'block growth' (on crop grow) event, use on grow

I did not have change to debug everything I 'fixed' here, since I worked on computer which doesn't have (quite complex to set up) debug environment. Please report bugs as usual :)

We will also soon see if my updater really works. It should, but this is first release for it to notify of, so...