Add DedicatedServer to MinecraftUtils/composites so that console commands work

Currently the server seems to crash with this when using a console command:

    [12:07:44] [Server thread/ERROR]: Encountered an unexpected exception
    java.lang.NullPointerException
      at org.granitepowered.granite.utils.MinecraftUtils.wrap(MinecraftUtils.java:81) ~[classes/:?]
      at org.granitepowered.granite.bytecode.classes.CommandHandlerClass$1.handle(CommandHandlerClass.java:55) ~[classes/:?]
      at org.granitepowered.granite.bytecode.BytecodeClass$ProxyHandler.preHandle(BytecodeClass.java:362) ~[classes/:?]
      at ab.a(SourceFile) ~[graniteClasses570668301615902894/:?]
      at pp.aN(SourceFile:332) ~[graniteClasses570668301615902894/:?]
      at pp.A(SourceFile:300) ~[graniteClasses570668301615902894/:?]
      at net.minecraft.server.MinecraftServer.z(SourceFile:532) ~[graniteClasses570668301615902894/:?]
      at net.minecraft.server.MinecraftServer.run(SourceFile:448) [graniteClasses570668301615902894/:?]
      at java.lang.Thread.run(Thread.java:745) [?:1.7.0_67]

Adding `DedicatedServer` to the composites field seems to make commands work normally:

    help
    [12:09:07] [Server thread/INFO]: --- Showing help page 1 of 9 (/help <page>) ---
    [12:09:07] [Server thread/INFO]: /achievement <give|take> <stat_name|*> [player]
    [12:09:07] [Server thread/INFO]: /ban <name> [reason ...]
    [12:09:07] [Server thread/INFO]: /ban-ip <address|name> [reason ...]
    [12:09:07] [Server thread/INFO]: /banlist [ips|players]
    [...]