Migrated to Gradle build

This commit migrates from a Maven-based build system to a Gradle-based
one. Changes include:

- Removed archetype & parent
- Renamed core, support, test, security and xml directories to
  spring-ws-core, spring-ws-test, spring-ws-security, spring-xml
  respectively.
- Moved samples to separate project
  (https://github.com/spring-projects/spring-ws-samples)

README.md

@@ -0,0 +1,78 @@
+# Spring Web Services
+Spring Web Services is a product of the Spring community focused on creating
+document-driven Web services. Spring Web Services aims to facilitate
+contract-first SOAP service development, allowing for the creation of flexible
+web services using one of the many ways to manipulate XML payloads.
+
+## Installation
+
+Releases of Spring Web Services are available for download from Maven Central,
+as well as our own repository, http://repo.springsource.org/release.
+
+For Maven users:
+
+    <repository>
+        <id>repository.spring.release</id>
+        <name>Spring GA Repository</name>
+        <url>http://repo.spring.io/release</url>
+    </repository>
+    ...
+    <dependency>
+        <groupId>org.springframework.ws</groupId>
+        <artifactId>spring-ws-core</artifactId>
+        <version>2.1.4</version>
+    </dependency>
+    
+## Snapshots
+
+Nightly snapshots of Spring Web Services are available for download from our
+snapshot repository, http://repo.springsource.org/snapshot.
+
+For Maven users:
+
+    <repository>
+        <id>repository.spring.snapshot</id>
+        <name>Spring Snapshot Repository</name>
+        <url>http://repo.spring.io/snapshot</url>
+    </repository>
+    ...
+    <dependency>
+        <groupId>org.springframework.ws</groupId>
+        <artifactId>spring-ws-core</artifactId>
+        <version>2.1.5.BUILD-SNAPSHOT</version>
+    </dependency>
+
+## Building from Source
+
+Spring Web Services uses a [Gradle](http://gradle.org)-based build system. In
+the instructions below, [`./gradlew`](http://vimeo.com/34436402) is invoked
+from the root of the source tree and serves as a cross-platform, self-contained
+bootstrap mechanism for the build. The only prerequisites are
+[Git](http://help.github.com/set-up-git-redirect) and JDK 1.7+.
+
+### check out sources
+`git clone git://github.com/spring-projects/spring-ws.git`
+
+### compile and test, build all jars, distribution zips and docs
+`./gradlew build`
+
+### install all spring-\* jars into your local Maven cache
+`./gradlew install`
+
+... and discover more commands with `./gradlew tasks`. See also the [Gradle build and release FAQ](https://github.com/spring-projects/spring-framework/wiki/Gradle-build-and-release-FAQ).
+
+## Documentation
+
+See the current
+[Javadoc](http://static.springsource.org/spring-ws/docs/current/javadoc-api)
+and [reference
+docs](http://static.springsource.org/spring-ws/docs/current/spring-ws-reference
+).
+
+## Issue Tracking
+
+Spring Scala uses [JIRA](https://jira.springsource.org/browse/SWS) for issue tracking purposes
+
+## License
+
+Spring Web Services is [Apache 2.0 licensed](http://www.apache.org/licenses/LICENSE-2.0.html).