Change packaging for mac to DMG

Fix changes packaging to dmg for mac and updates README.md to mention new format for macOS installers.

Author: dgolovin

README.md

@@ -20,7 +20,7 @@ the GNU LGPL license, more details on <https://www.7zip.org>).
 
 #### macOS
 
-Both Installers are zipped macOS Application Bundles.
+Each Installer is a disk image (.dmg file) with macOS Application Bundle inside.
 
 Architecture
 ------------
@@ -117,8 +117,8 @@ in bash terminal
 
         npm run dist:mac
 
-After build finishes ./dist folder should contain zipped macOS application
-package files for On-line and Bundle Installers.
+After build finishes ./dist folder should contain disk image files (.dmg) with macOS application
+packages for On-line and Bundle Installers.
 
 #### Linux
 

gulp-tasks/dist-darwin.js

@@ -25,7 +25,7 @@ function buildInstaller(gulp, origin, destination, extraFiles) {
       mac: {
         category: 'public.app-category.developer-tools',
         icon: 'resources/devsuite.icns',
-        target: ['zip'],
+        target: ['dmg'],
         publish: null
       },
       files: '**/*',
@@ -68,8 +68,8 @@ function darwinDist(gulp, reqs) {
 
   gulp.task('dist-bundle', ['prefetch'], function() {
     return buildInstaller(gulp,
-      `dist/${productName}-${productVersion}-mac.zip`,
-      `dist/devsuite-${productVersion}-bundle-installer-mac.zip`,
+      `dist/${productName}-${productVersion}.dmg`,
+      `dist/devsuite-${productVersion}-bundle-installer-mac.dmg`,
       [{
         'from': 'requirements-cache',
         'to': '.',
@@ -79,13 +79,16 @@ function darwinDist(gulp, reqs) {
 
   gulp.task('dist-simple', function() {
     return buildInstaller(gulp,
-      `dist/${productName}-${productVersion}-mac.zip`,
-      `dist/devsuite-${productVersion}-installer-mac.zip`
+      `dist/${productName}-${productVersion}.dmg`,
+      `dist/devsuite-${productVersion}-installer-mac.dmg`
     );
   });
 
   gulp.task('cleanup', function() {
-    return del(['dist/mac', `dist/${productName}-${productVersion}-mac.zip`],
+    return del([
+      'dist/mac',
+      `dist/${productName}-${productVersion}.dmg`,
+      `dist/${productName}-${productVersion}.dmg.blockmap`],
       { force: false });
   });