Rename {tar,zip}ball and packaged directory

{Tar,zip}balls now have the form openseadragon-bin-0.9.125.{tar.gz,zip},
containing a directory openseadragon-bin-0.9.125.

Including the project's version number makes it easy to determine the
version of a random release sitting around a filesystem, and ensures
that unpacking a tarball won't overwrite another unpacked tarball or
write into a checked-out repo.

Adding -bin distinguishes the packages from source tarballs, which are
conventionally <project>-<version>.{tar.gz,zip}.

Gruntfile.js

@@ -12,8 +12,11 @@ module.exports = function(grunt) {
     grunt.loadNpmTasks("grunt-git-describe");
 
     // ----------
-    var distribution = "build/openseadragon/openseadragon.js",
+    var packageJson = grunt.file.readJSON("package.json"),
+        distribution = "build/openseadragon/openseadragon.js",
         minified = "build/openseadragon/openseadragon.min.js",
+        packageDirName = "openseadragon-bin-" + packageJson.version,
+        packageDir = "build/" + packageDirName + "/",
         releaseRoot = "../site-build/built-openseadragon/",
         sources = [
             "src/openseadragon.js",
@@ -49,9 +52,10 @@ module.exports = function(grunt) {
     // ----------
     // Project configuration.
     grunt.initConfig({
-        pkg: grunt.file.readJSON("package.json"),
+        pkg: packageJson,
         clean: {
             build: ["build"],
+            "package": [packageDir],
             release: {
                 src: [releaseRoot],
                 options: {
@@ -84,20 +88,20 @@ module.exports = function(grunt) {
         compress: {
             zip: {
                 options: {
-                    archive: "build/openseadragon.zip",
+                    archive: "build/" + packageDirName + ".zip",
                     level: 9
                 },
                 files: [
-                   { expand: true, cwd: "build/", src: ["openseadragon/**"] }
+                   { expand: true, cwd: "build/", src: [ packageDirName + "/**" ] }
                 ]
             },
             tar: {
                 options: {
-                    archive: "build/openseadragon.tar.gz",
+                    archive: "build/" + packageDirName + ".tar.gz",
                     level: 9
                 },
                 files: [
-                   { expand: true, cwd: "build/", src: [ "openseadragon/**" ] }
+                   { expand: true, cwd: "build/", src: [ packageDirName + "/**" ] }
                 ]
             }
         },
@@ -152,6 +156,18 @@ module.exports = function(grunt) {
         grunt.file.copy("changelog.txt", "build/changelog.txt");
     });
 
+    // ----------
+    // Copy:package task.
+    // Creates a directory tree to be compressed into a package.
+    grunt.registerTask("copy:package", function() {
+        grunt.file.recurse("build/openseadragon", function(abspath, rootdir, subdir, filename) {
+            var dest = packageDir
+                + (subdir ? subdir + "/" : '/')
+                + filename;
+            grunt.file.copy(abspath, dest);
+        });
+    });
+
     // ----------
     // Copy:release task.
     // Copies the contents of the build folder into the release folder.
@@ -180,7 +196,7 @@ module.exports = function(grunt) {
     // ----------
     // Package task.
     // Builds and creates the .zip and .tar.gz files.
-    grunt.registerTask("package", ["build", "compress"]);
+    grunt.registerTask("package", ["build", "copy:package", "compress", "clean:package"]);
 
     // ----------
     // Publish task.