DATACOUCH-146 - Reactive repositories support

- Adds experimental support for reactor types in reactive CRUD and Sorting
  repositories using RxJava1Template
- Refactor configuration and query classes to be reusable by reactive repositories

Original pull request: #130.

pom.xml

@@ -84,6 +84,27 @@
             <optional>true</optional>
         </dependency>
 
+        <dependency>
+            <groupId>io.projectreactor</groupId>
+            <artifactId>reactor-core</artifactId>
+            <version>${reactor}</version>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>io.reactivex</groupId>
+            <artifactId>rxjava</artifactId>
+            <version>${rxjava}</version>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>io.reactivex</groupId>
+            <artifactId>rxjava-reactive-streams</artifactId>
+            <version>${rxjava-reactive-streams}</version>
+            <optional>true</optional>
+        </dependency>
+
         <!-- JSR 303 Validation -->
         <dependency>
             <groupId>javax.validation</groupId>