Always get metadata from injected DOM Document

The `Document` class for reading DOM document metadata takes an optional
DOM `Document` constructor argument as a test seam.

However the actual code only used the injected document in some places,
in others it used jQuery which in turn reads from the global
`window.document`.

Refactor this code to use the injected DOM Document everywhere and
remove the jQuery dependency.

src/annotator/plugin/document.coffee

-$ = require('jquery')
 baseURI = require('document-base-uri')
 
 Plugin = require('../plugin')
@@ -85,9 +84,9 @@ module.exports = class Document extends Plugin
 
   _getMetaTags: (prefix, attribute, delimiter) =>
     tags = {}
-    for meta in $("meta")
-      name = $(meta).attr(attribute)
-      content = $(meta).prop("content")
+    for meta in @document.querySelectorAll('meta')
+      name = meta.getAttribute(attribute)
+      content = meta.content
       if name
         match = name.match(RegExp("^#{prefix}#{delimiter}(.+)$", "i"))
         if match
@@ -112,19 +111,18 @@ module.exports = class Document extends Plugin
     else if @metadata.dc.title
       @metadata.title = @metadata.dc.title[0]
     else
-      @metadata.title = $("head title").text()
+      @metadata.title = @document.title
 
   _getLinks: =>
     # we know our current location is a link for the document
     @metadata.link = [href: this._getDocumentHref()]
 
     # look for some relevant link relations
-    for link in $("link")
-      l = $(link)
-      href = this._absoluteUrl(l.prop('href')) # get absolute url
-      rel = l.prop('rel')
-      type = l.prop('type')
-      lang = l.prop('hreflang')
+    for link in @document.querySelectorAll('link')
+      href = this._absoluteUrl(link.href) # get absolute url
+      rel = link.rel
+      type = link.type
+      lang = link.hreflang
 
       if rel not in ["alternate", "canonical", "bookmark", "shortlink"] then continue
 
@@ -177,8 +175,8 @@ module.exports = class Document extends Plugin
       @metadata.documentFingerprint = dcUrn
 
   _getFavicon: =>
-    for link in $("link")
-      if $(link).prop("rel") in ["shortcut icon", "icon"]
+    for link in @document.querySelectorAll('link')
+      if link.rel in ["shortcut icon", "icon"]
         @metadata["favicon"] = this._absoluteUrl(link.href)
 
   # Hack to get a absolute url from a possibly relative one

src/annotator/plugin/test/document-test.coffee

@@ -176,6 +176,7 @@ describe 'Document', ->
     createDoc = (href, baseURI) ->
       fakeDocument =
         createElement: document.createElement.bind(document),
+        querySelectorAll: document.querySelectorAll.bind(document),
         location:
           href: href
       doc = new Document($('<div></div>')[0], {