Add watcher interface that combines a query, filters, and a trigger.

diff --git a/src/main/java/net/pterodactylus/rhynodge/Watcher.java b/src/main/java/net/pterodactylus/rhynodge/Watcher.java
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+++ b/src/main/java/net/pterodactylus/rhynodge/Watcher.java
@@ -0,0 +1,51 @@
+/*
+ * Rhynodge - Watcher.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.rhynodge;
+
+import java.util.List;
+
+/**
+ * A {@code Watcher} combines a {@link Query}, a number of {@link Filter}s, and
+ * a {@link Trigger}, as these parts are closely related after all.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public interface Watcher {
+
+       /**
+        * Returns the query of the watcher.
+        *
+        * @return The query of the watcher
+        */
+       public Query query();
+
+       /**
+        * Returns the filters of the watcher.
+        *
+        * @return The filters of the watcher
+        */
+       public List<Filter> filters();
+
+       /**
+        * Returns the trigger of the watcher.
+        *
+        * @return The trigger of the watcher
+        */
+       public Trigger trigger();
+
+}