Simplify async loading scripts.

For a more intuitive installation, remove async.coffee and stop
compiling/minifying zxcvbn-async.js. Instead, keep zxcvbn-async.js
readable and edit directly. Also add a zxcvbn-async-bower.js variant to
fix bower setup.

.gitignore

@@ -1,5 +1,7 @@
 *~
 *.js
 !zxcvbn.js
+!zxcvbn-async.js
+!zxcvbn-async-bower.js
 test/index_dev.html
 node_modules

compile_and_minify.sh

@@ -9,7 +9,12 @@ function_wrap () {
 
 echo 'compiling cs -> js'
 coffee --compile --bare {matching,scoring,init}.coffee
-coffee --compile async.coffee
+
+# bower's async loading uses a different relative path 
+cp zxcvbn-async.js zxcvbn-async-bower.js
+sed -i '' 's/zxcvbn.js/bower_components\/zxcvbn\/zxcvbn.js/' zxcvbn-async-bower.js
+sed -i '' '/^\/\//d' zxcvbn-async-bower.js
+sed -i '' '/^$/d' zxcvbn-async-bower.js
 
 echo 'compiling js -> js'
 # closure's simple optimizations ended up being about 200k better than whitespace-only.
@@ -18,6 +23,5 @@ echo 'compiling js -> js'
 COMPILATION_LEVEL=SIMPLE_OPTIMIZATIONS
 cat {matching,scoring,adjacency_graphs,frequency_lists,init}.js  | function_wrap > compiled.js
 java -jar tools/closure.jar --compilation_level $COMPILATION_LEVEL --js compiled.js --js_output_file zxcvbn.js
-java -jar tools/closure.jar --compilation_level $COMPILATION_LEVEL --js async.js    --js_output_file zxcvbn-async.js
 rm -f compiled.js
-echo 'done. produced zxcvbn.js and zxcvbn-async.js'
+echo 'done'

zxcvbn-async-bower.js

@@ -0,0 +1,17 @@
+(function() {
+  var ZXCVBN_SRC = 'bower_components/zxcvbn/zxcvbn.js';
+  var async_load = function() {
+    var first, s;
+    s = document.createElement('script');
+    s.src = ZXCVBN_SRC;
+    s.type = 'text/javascript';
+    s.async = true;
+    first = document.getElementsByTagName('script')[0];
+    return first.parentNode.insertBefore(s, first);
+  };
+  if (window.attachEvent != null) {
+    window.attachEvent('onload', async_load);
+  } else {
+    window.addEventListener('load', async_load, false);
+  }
+}).call(this);

zxcvbn-async.js

@@ -1 +1,31 @@
-(function(){var a;a=function(){var a,b;b=document.createElement("script");b.src="zxcvbn.js";b.type="text/javascript";b.async=!0;a=document.getElementsByTagName("script")[0];return a.parentNode.insertBefore(b,a)};null!=window.attachEvent?window.attachEvent("onload",a):window.addEventListener("load",a,!1)}).call(this);
+// cross-browser asynchronous script loading for zxcvbn.
+// adapted from http://friendlybit.com/js/lazy-loading-asyncronous-javascript/
+
+// Suggestion: instead of manually configuring this script,
+// follow the bower setup instructions (see README) for easier installation and
+// updating.
+
+// If you do want to manually include zxcvbn, you'll likely only need to change
+// ZXCVBN_SRC to point to the correct relative path from your index.html.
+// (this script assumes index.html and zxcvbn.js sit next to each other.)
+
+(function() {
+  var ZXCVBN_SRC = 'zxcvbn.js';
+
+  var async_load = function() {
+    var first, s;
+    s = document.createElement('script');
+    s.src = ZXCVBN_SRC;
+    s.type = 'text/javascript';
+    s.async = true;
+    first = document.getElementsByTagName('script')[0];
+    return first.parentNode.insertBefore(s, first);
+  };
+
+  if (window.attachEvent != null) {
+    window.attachEvent('onload', async_load);
+  } else {
+    window.addEventListener('load', async_load, false);
+  }
+
+}).call(this);