Add regression tests for the HTML entity bug

This is the minimal reproducible test-case for this bug.

There's one test for each flavor of chosen, and I've confirmed that this
does, indeed, fail on master.

spec/jquery/searching.spec.coffee

@@ -0,0 +1,28 @@
+describe "Searching", ->
+  it "should not match the actual text of HTML entities", ->
+    tmpl = "
+      <select data-placeholder='Choose an HTML Entity...'>
+        <option value=''></option>
+        <option value='This & That'>This &amp; That</option>
+        <option value='This < That'>This &lt; That</option>
+      </select>
+    "
+
+    div = $("<div>").html(tmpl)
+    select = div.find("select")
+    select.chosen({search_contains: true})
+
+    container = div.find(".chosen-container")
+    container.trigger("mousedown") # open the drop
+
+    # Both options should be active
+    results = div.find(".active-result")
+    expect(results.size()).toBe(2)
+
+    # Search for the html entity by name
+    search_field = div.find(".chosen-search input").first()
+    search_field.val("mp")
+    search_field.trigger("keyup")
+
+    results = div.find(".active-result")
+    expect(results.size()).toBe(0)

spec/proto/searching.spec.coffee

@@ -0,0 +1,30 @@
+describe "Searching", ->
+  it "should not match the actual text of HTML entities", ->
+    tmpl = "
+      <select data-placeholder='Choose an HTML Entity...'>
+        <option value=''></option>
+        <option value='This & That'>This &amp; That</option>
+        <option value='This < That'>This &lt; That</option>
+      </select>
+    "
+
+    div = new Element('div')
+    document.body.insert(div)
+    div.update(tmpl)
+    select = div.down('select')
+    new Chosen(select, {search_contains: true})
+
+    container = div.down('.chosen-container')
+    simulant.fire(container, 'mousedown') # open the drop
+
+    # Both options should be active
+    results = div.select('.active-result')
+    expect(results.length).toBe(2)
+
+    # Search for the html entity by name
+    search_field = div.down(".chosen-search input")
+    search_field.value = "mp"
+    simulant.fire(search_field, 'keyup')
+
+    results = div.select(".active-result")
+    expect(results.length).toBe(0)