Sanitize Bukkit Command Label Before Passing On (#149)

Fixes #146 

This might not be the 100% perfect method for fixing this, but as it stands, it's the least amount of diff
 needed to fix said issue.

CONTRIBUTORS.md

@@ -10,3 +10,4 @@ If you open a PR and are not already in this file, please feel free to add yours
 * [***kashike***](https://github.com/aikar/commands/commits?author=kashike) - Sponge Support, Random nit picks
 * [***Williambraecky***](https://github.com/aikar/commands/commits?author=Williambraecky) - BungeeCord Support
 * [***dumptruckman***](https://github.com/aikar/commands/commits?author=dumptruckman) - JDA Support
+* [***willies952002***](https://github.com/aikar/commands/commits?author=willies952002)

bukkit/src/main/java/co/aikar/commands/BukkitRootCommand.java

@@ -60,6 +60,7 @@ public class BukkitRootCommand extends Command implements RootCommand {
 
     @Override
     public boolean execute(CommandSender sender, String commandLabel, String[] args) {
+        if (commandLabel.contains(":")) commandLabel = ACFPatterns.COLON.split(commandLabel, 2)[1];
         execute(manager.getCommandIssuer(sender), commandLabel, args);
         return true;
     }