Add prepublish script for vsce

Also removed "build" dependency from "release" task since "vsce:prepublish" script will do build

.gitignore

@@ -1,8 +1,9 @@
 .DS_Store
 .idea
+*.vsix
 node_modules/
 out/
 test/testProject/.vscode/
 test/testProject/platforms/
 test/testProject/plugins/
-test/testProject/typings/
+test/testProject/typings/

gulpfile.js

@@ -125,7 +125,7 @@ gulp.task('watch-build-test', ['build', 'build-test'], function() {
     return gulp.watch(sources, ['build', 'build-test']);
 });
 
-gulp.task('release', ['build'], function () {
+gulp.task('release', function () {
     var licenseFiles = ["LICENSE.txt", "ThirdPartyNotices.txt"];
     var backupFolder = path.resolve(path.join(os.tmpdir(), 'vscode-cordova'));
     if (!fs.existsSync(backupFolder)) {

package.json

@@ -439,7 +439,8 @@
   "scripts": {
     "compile": "node ./node_modules/gulp/bin/gulp",
     "postinstall": "node ./node_modules/vscode/bin/install",
-    "test": "node ./node_modules/mocha/bin/mocha --recursive -u bdd ./out/test/debugger"
+    "test": "node ./node_modules/mocha/bin/mocha --recursive -u bdd ./out/test/debugger",
+    "vscode:prepublish": "gulp"
   },
   "dependencies": {
     "cordova-simulate": "^0.3.0",