Last night's hacks

Fixed a few spelling errors in readme.
Hacked in something that allows the spawnmob command to spawn wither
skeletons.

/spawnmob is in need of a rework.
Consider #857 Closed

Mobs now spawn with items.
Also added spawn effect.

Can spawn Wither Skeleton with /spawnmob witherskeleton

Console can name mobs.
Fixes dumb logic.

This should be ready to pull.

May revisit later.
Merge pull request #994 from RlonRyan/develop

Closes #857