Made LWJGL dynamic

LWJGL update is now dynamic, it go reads from http://get.spout.org/api/minecraft 

The pages need to be updated to have the proper groupID & such. Here's one that works.

Seems working locally on Windows & OSX. Didin't test on linux but shoudn't break.

{"minecraft_version":"1.5.1","minecraft_hash":"5c1219d869b87d233de3033688ec7567","libraries":[{"groupId":"org.lwjgl.lwjgl","artifactId":"lwjgl","version":"2.9.0","hash":"ce74486a7687ad7ea91dcc1fcd6977b8"},{"groupId":"org.lwjgl.lwjgl","artifactId":"lwjgl_util","version":"2.9.0","hash": "6a0eeaf3451ed9646b7d61a9dd8b86cc"},{"groupId":"net.java.jinput","artifactId":"jinput","version":"2.0.5","hash":"cc07d371f79dc4ed2239e1101ae06313"},{"groupId":"org.lwjgl.lwjgl","artifactId":"lwjgl-platform","version":"2.9.0-natives-windows","hash":"30e99b9386040f387fd94c26c1ac64d3"},{"groupId":"org.lwjgl.lwjgl","artifactId":"lwjgl-platform","version":"2.9.0-natives-osx","hash":"722da64d6286a030e5e60d7678c27edc"},{"groupId":"org.lwjgl.lwjgl","artifactId":"lwjgl-platform","version":"2.9.0-natives-linux","hash":"3b4435ec85e63faa041b4c080b815b22"}]}