I received this code:
Exception in thread "main" java.lang.UnsatisfiedLinkError: /Users/brandonneel/Library/Application Support/minecraft/versions/1.8.1/1.8.1-natives-1422154005580764000/liblwjgl.dylib: Library not loaded: @rpath/libjawt.dylib Referenced from: /Users/brandonneel/Library/Application Support/minecraft/versions/1.8.1/1.8.1-natives-1422154005580764000/liblwjgl.dylib Reason: image not found
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1861)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1785)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1045)
at org.lwjgl.Sys$1.run(Sys.java:73)
at java.security.AccessController.doPrivileged(Native Method)
at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
at org.lwjgl.Sys.loadLibrary(Sys.java:95)
at org.lwjgl.Sys.<clinit>(Sys.java:112)
at bss.I(SourceFile:2488)
at net.minecraft.client.main.Main.main(SourceFile:41)

I checked and I no longer have the file "1.8.1-natives-1422154005580764000"

I didn't alter anything so I have no idea why this vanished. I still have all the "native" folders for older versions.