Restructured project to version builds and move CSS into src.

* Added a new version implementation to the build. The build task now triggers
  an increment to the build version.
* Reconfigured the war plugin to filter source files and replace the @version@
  token with the project version and to rename css and js files to include the
  version number in the filename.

shell.gradle

@@ -0,0 +1,33 @@
+// ## Utility methods for working with processes.
+
+def shell_(List<String> cmd) { shell(cmd, null, false) }
+def shell_(String... cmd) { shell(cmd, null, false) }
+def shell(String... cmd) { shell(cmd, null, true) }
+
+def shell(List<String> cmd, File workingDir, boolean checkExit) {
+    shell(cmd as String[], workingDir, checkExit) }
+
+def shell(String[] cmd, File workingDir, boolean checkExit) {
+    def pb = new ProcessBuilder(cmd)
+    if (workingDir) pb.directory(workingDir)
+    def process = pb.start()
+    process.waitForProcessOutput(System.out, System.err)
+
+    if (process.exitValue() != 0)
+        println "Command $cmd exited with non-zero result code."
+    if (checkExit) assert process.exitValue() == 0 : "Not ignoring failed command." }
+
+def shell(List<List<String>> cmds, File workingDir) {
+    cmds.each {
+        ProcessBuilder pb = new ProcessBuilder(it)
+        pb.directory(workingDir)
+        pb.start().waitForProcessOutput(System.out, System.err) } }
+
+def spawn(String... cmd) { spawn(cmd, null) }
+def spawn(List<String> cmd, File workingDir) { spawn(cmd as String[], workingDir) }
+def spawn(String[] cmd, File workingDir) {
+    def pb = new ProcessBuilder(cmd)
+    if (workingDir) pb.directory(workingDir)
+    def process = pb.start() }
+
+