fix issues walterhiggins#256 and walterhiggins#287

Fix API generation

added new entities and spawn modules

removing bukkit-1.7.10 - replaced with spigotmc-1.8.8

Fix issue walterhiggins#261

fixes issue walterhiggins#254

version bump to 3.1.7

fixing fireworks problem on mac os

Update README.md

Merge pull request walterhiggins#242 from carlrobert/patch-16

Trivial typo