Added alliance only chat mode.

src/com/massivecraft/factions/struct/ChatMode.java

@@ -0,0 +1,28 @@
+package com.massivecraft.factions.struct;
+
+public enum ChatMode {
+	FACTION(2, "faction chat"),
+	ALLIANCE(1, "alliance chat"),
+	PUBLIC(0, "public chat");
+	
+	public final int value;
+	public final String nicename;
+	
+	private ChatMode(final int value, final String nicename) {
+        this.value = value;
+        this.nicename = nicename;
+    }
+	
+	public boolean isAtLeast(ChatMode role) {
+		return this.value >= role.value;
+	}
+	
+	public boolean isAtMost(ChatMode role) {
+		return this.value <= role.value;
+	}
+
+	@Override
+	public String toString() {
+		return this.nicename;
+	}
+}