SyslogHandler

- Added new handler

SyslogHandler (unittests)

- Added test case

source/dlog/syslog.d

@@ -0,0 +1,57 @@
+module dlog.syslog;
+
+import core.sys.posix.syslog : openlog, syslog, closelog;
+
+import dlog.core : Handler, Message;
+import dlog.basic : BasicMessage;
+
+/** 
+ * A file-based handler which
+ * writes `BasicMessage`(s)
+ * to a provided file
+ */
+public class SyslogHandler : Handler
+{
+    this(string name)
+    {
+        // TODO: what top set options and facility to?
+        openlog(name.ptr, 0, 0);
+    }
+
+    /** 
+     * Handles the message, does a
+     * no-op if the message is
+     * not a kind-of `BasicMessage`
+     *
+     * Params:
+     *   message = the message
+     */
+    public void handle(Message message)
+    {
+        // Only handle BasicMessage(s)
+        BasicMessage bmesg = cast(BasicMessage)message;
+        if(bmesg)
+        {
+            // TODO: What to set priortiy to?
+            syslog(0, bmesg.getText().ptr);
+        }
+    }
+
+    ~this()
+    {
+        closelog();
+    }
+}
+
+unittest
+{
+    BasicLogger log = new BasicLogger();
+    log.addHandler(new SyslogHandler("Ting"));
+    log.log(new BasicMessage("Howdy"));
+
+}
+
+version(unittest)
+{
+    import dlog.basic;
+}