add application plugin to gradle

to allows testing the shell easily

build.gradle

@@ -21,6 +21,7 @@ apply plugin: 'eclipse'
 apply plugin: 'idea'
 apply from: "$rootDir/maven.gradle"
 apply plugin: 'docbook-reference'
+apply plugin: 'application'
 
 [compileJava, compileTestJava]*.options*.compilerArgs = ["-Xlint:-serial"]
 
@@ -149,7 +150,7 @@ task schemaZip(type: Zip) {
     }
 }
 
-task distZip(type: Zip, dependsOn: [jar, docsZip, sourcesJar, javadocJar]) {
+task distroZip(type: Zip, dependsOn: [jar, docsZip, sourcesJar, javadocJar]) {
     group = 'Distribution'
     classifier = 'dist'
     description = "Builds -${classifier} archive, containing all jars and docs, " +
@@ -188,7 +189,7 @@ artifacts {
 
     archives docsZip
 //    archives schemaZip
-    archives distZip
+    archives distroZip
 }
 
 task wrapper(type: Wrapper) {
@@ -196,5 +197,8 @@ task wrapper(type: Wrapper) {
     gradleVersion = '1.0'
 }
 
+
+mainClassName = "org.springframework.shell.Bootstrap"
+
 assemble.dependsOn = ['jar', 'sourcesJar']
 defaultTasks 'build'