Let luaAsInt() return sensible values for non-numeric data.

src/main/java/lua/value/LBoolean.java

@@ -24,6 +24,10 @@ public final class LBoolean extends LValue {
 		return m_value;
 	}
 	
+	public final int luaAsInt() {
+		return m_value? 1: 0;
+	}
+	
 	public final static LBoolean valueOf(boolean value) {
 		return value? TRUE: FALSE;
 	}

src/main/java/lua/value/LValue.java

@@ -105,7 +105,6 @@ public class LValue {
 
 	/** Return value as an integer */
 	public int luaAsInt() {
-		luaUnsupportedOperation();
 		return 0;
 	}