UNOMI-449 deprecate servlets (#283)

diff --git a/wab/src/main/java/org/apache/unomi/web/ClientServlet.java b/wab/src/main/java/org/apache/unomi/web/ClientServlet.java
index c105302..e87f54f 100644
--- a/wab/src/main/java/org/apache/unomi/web/ClientServlet.java
+++ b/wab/src/main/java/org/apache/unomi/web/ClientServlet.java
@@ -29,8 +29,10 @@
 import java.io.IOException;
 
 /**
+ * @deprecated please use the rest endpoint {@link org.apache.unomi.rest.ClientEndpoint} instead of this servlet
  * A servlet filter to serve a context-specific Javascript containing the current request context object.
  */
+@Deprecated
 public class ClientServlet extends HttpServlet {
 
     private static final Logger logger = LoggerFactory.getLogger(ClientServlet.class.getName());
diff --git a/wab/src/main/java/org/apache/unomi/web/ContextServlet.java b/wab/src/main/java/org/apache/unomi/web/ContextServlet.java
index ee93a2c..8588c0b 100644
--- a/wab/src/main/java/org/apache/unomi/web/ContextServlet.java
+++ b/wab/src/main/java/org/apache/unomi/web/ContextServlet.java
@@ -29,8 +29,10 @@
 import java.io.IOException;
 
 /**
+ * @deprecated please use the rest endpoint {@link org.apache.unomi.rest.ContextJsonEndpoint} instead of this servlet
  * A servlet filter to serve a context-specific Javascript containing the current request context object.
  */
+@Deprecated
 public class ContextServlet extends HttpServlet {
     private static final long serialVersionUID = 2928875830103325238L;
     private static final Logger logger = LoggerFactory.getLogger(ContextServlet.class.getName());
diff --git a/wab/src/main/java/org/apache/unomi/web/EventsCollectorServlet.java b/wab/src/main/java/org/apache/unomi/web/EventsCollectorServlet.java
index 8268b76..d173b44 100644
--- a/wab/src/main/java/org/apache/unomi/web/EventsCollectorServlet.java
+++ b/wab/src/main/java/org/apache/unomi/web/EventsCollectorServlet.java
@@ -27,6 +27,10 @@
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
+/**
+ * @deprecated please use the rest endpoint {@link org.apache.unomi.rest.EventsCollectorEndpoint} instead of this servlet
+ */
+@Deprecated
 public class EventsCollectorServlet extends HttpServlet {
     private static final long serialVersionUID = 2008054804885122957L;
     private static final Logger logger = LoggerFactory.getLogger(EventsCollectorServlet.class.getName());