INTEXT-40 Add ZIP Transformer

* Add zip-transformer
* Add unzip-transformer
* Add UnZipResultSplitter
* Add sample

For reference see: https://jira.springsource.org/browse/INTEXT-40

samples/zip/README.md

@@ -0,0 +1,56 @@
+Spring Integration Zip Sample
+===================
+
+This sample illustrates the usage of the Spring Integration Zip Extension. It uses the following components:
+
+* zip-transformer
+* unzip-transformer
+
+You can run the application by either
+
+* running the "Main" class from within STS (Right-click on Main class --> Run As --> Java Application)
+* or from the command line:
+    - mvn package
+    - mvn exec:java
+
+You should see a screen as the following:
+
+```
+=========================================================
+
+    Welcome to the Spring Integration Zip Sample
+
+    For more information please visit:
+    http://www.springsource.org/spring-integration
+
+=========================================================
+17:08:41.883 INFO  [org.springframework.integration.samples.zip.Main.main()][org.springframework.integration.samples.zip.SpringIntegrationUtils]
+=========================================================
+
+    Intput directory is: '/dev/spring-integration-extensions/samples/zip/input-zip'
+    Intput directory is: '/dev/spring-integration-extensions/samples/zip/input-uncompressed'
+    Output directory is: 'target/output/decompressedFilesOut'
+    Output directory is: 'target/output/zipFilesOut'
+
+=========================================================
+17:08:41.887 INFO  [org.springframework.integration.samples.zip.Main.main()][org.springframework.integration.samples.zip.Main]
+=========================================================
+
+    Please press 'q + Enter' to quit the application.
+
+=========================================================
+```
+## Compressing Files
+
+Drop an uncompressed file into the **input-uncompressed** directory. The file will be compressed and stored under **target/output/zipFilesOut**.
+
+## Uncompressing Files
+
+Drop a compressed file into the **input-zip** directory. The file will be decompressed and stored under **target/output/decompressedFilesOut**.
+
+--------------------------------------------------------------------------------
+
+For help please take a look at the Spring Integration documentation:
+
+http://www.springsource.org/spring-integration
+