Fix dependencies instead of *

It's anyway a good idea (the way it is currently, any breaking update to the dependencies will break this package), and I think it's causing https://github.com/mhsjlw/node-voxel-worldgen/issues/2

In the end the problem was a too long install time.
It's kind of related to this though.

Are all deps necessary ? Does rust have "devDependencies" that are only installed during dev and not when other packages install it ?

looks like image is only needed in bin.rs which isn't exported afaik.

same idea for time

voxel_worldgen/src/lib.rs

Line 4 in a5e19e8

extern crate time;

(I think ?)

Ah but the binary is in https://github.com/hansihe/voxel_worldgen/blob/master/Cargo.toml#L14

There are a lot of unneeded dependencies right now, I will try to get them removed. I believe image is one of the biggest dependencies, and it is only used for development.

http://doc.crates.io/manifest.html#the-dev-dependencies-section rust indeed has dev dependencies