Load later plugins with custom loader, fixes API
Added extra information to CONTRIBUTING.md about issue titles
Fixed #1882 Race-condition on multiple world generation, causing lock of the geneartion thread
Alternate chunk generation between multiple levels
Fixed #1901, EmptyChunkSection gets replaced by invalid Section
Remove player unset limitations
Added Chiseled stone brick, red sand, end stone
Added item activation, zombie spawn egg
Added Villager spawn egg
Fixed AddEntityPacket, added base Arrow
Check if player is online before showing
Fixed indent
Merge pull request #1910 from Falkirks/master

Improve behaviour of showPlayer()
Merge pull request #1 from PocketMine/master

update master