Add bind-dictionary extension

extensions/bind-dictionary/README.md

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+# Bind Dictionary
+
+This extension overwrites the default bind behavior and allows you to bind multiple combinations in a single bind call.
+
+Usage looks like:
+
+```javascript
+Mousetrap.bind({
+    'a': function() { console.log('a'); },
+    'b': function() { console.log('b'); }
+});
+```
+
+You can optionally pass in ``keypress``, ``keydown`` or ``keyup`` as a second argument.
+
+Other bind calls work the same way as they do by default.

extensions/bind-dictionary/bind-dictionary.js

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+/**
+ * Overwrites default Mousetrap.bind method to optionally accept
+ * an object to bind multiple key events in a single call
+ *
+ * You can pass it in like:
+ *
+ * Mousetrap.bind({
+ *     'a': function() { console.log('a'); },
+ *     'b': function() { console.log('b'); }
+ * });
+ *
+ * And can optionally pass in 'keypress', 'keydown', or 'keyup'
+ * as a second argument
+ */
+Mousetrap = (function(Mousetrap) {
+    var self = Mousetrap,
+        _oldBind = self.bind,
+        args;
+
+    self.bind = function() {
+        args = arguments;
+
+        // normal call
+        if (typeof args[0] == 'string' || args[0] instanceof Array) {
+            return _oldBind(args[0], args[1], args[2]);
+        }
+
+        // object passed in
+        for (var key in args[0]) {
+            if (args[0].hasOwnProperty(key)) {
+                _oldBind(key, args[0][key], args[1]);
+            }
+        }
+    };
+
+    return self;
+}) (Mousetrap);

extensions/bind-dictionary/bind-dictionary.min.js

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+Mousetrap=function(b){var c=b.bind,a;b.bind=function(){a=arguments;if("string"==typeof a[0]||a[0]instanceof Array)return c(a[0],a[1],a[2]);for(var b in a[0])a[0].hasOwnProperty(b)&&c(b,a[0][b],a[1])};return b}(Mousetrap);