Docs: Use https urls on the plugin page, fix a dead link

Author: papandreou

documentation/plugins.md

@@ -12,17 +12,17 @@ output styles and themes.
 
 Here's a partial list of plugins for Unexpected:
 
-* [unexpected-check](http://unexpected.js.org/unexpected-check/): Property
+* [unexpected-check](https://unexpected.js.org/unexpected-check/): Property
   based testing using unexpected.
-* [unexpected-color](http://unexpected.js.org/unexpected-color/): Assertions for
+* [unexpected-color](https://unexpected.js.org/unexpected-color/): Assertions for
   strings representing colors.
 * [unexpected-couchdb](https://github.com/alexjeffburke/unexpected-couchdb/):
   Run your tests against a mock CouchDB server initialized to a given state.
-* [unexpected-date](http://sushantdhiman.com/projects/unexpected-date/): Date/time assertions on Date object.
-* [unexpected-dom](http://unexpected.js.org/unexpected-dom/): Assertions for
+* [unexpected-date](https://sushantdhiman.com/projects/unexpected-date/): Date/time assertions on Date object.
+* [unexpected-dom](https://unexpected.js.org/unexpected-dom/): Assertions for
   XML/HTML DOM and HTML/XML strings. Works in the browser and in node.js via
   [jsdom](https://github.com/tmpvar/jsdom).
-* [unexpected-exif](http://unexpected.js.org/unexpected-exif/): Assertions for
+* [unexpected-exif](https://unexpected.js.org/unexpected-exif/): Assertions for
   EXIF data of images (node.js only).
 * [unexpected-events](https://github.com/alexjeffburke/unexpected-events/):
   Assertions for unit testing EventEmitters.
@@ -33,28 +33,28 @@ Here's a partial list of plugins for Unexpected:
 * [unexpected-http](https://github.com/unexpectedjs/unexpected-http/): Assertions for
   testing local or remote HTTP servers.
   Browser-compatible via browserify (experimental).
-* [unexpected-image](http://unexpected.js.org/unexpected-image/): Assertions for
+* [unexpected-image](https://unexpected.js.org/unexpected-image/): Assertions for
   image metadata (node.js only).
-* [unexpected-knockout](http://unexpected.js.org/unexpected-knockout/): Add support
-  for [Knockout.js](http://knockoutjs.com/) observables.
-* [unexpected-messy](http://unexpected.js.org/unexpected-messy/): Assertions for
+* [unexpected-knockout](https://unexpected.js.org/unexpected-knockout/): Add support
+  for [Knockout.js](https://knockoutjs.com/) observables.
+* [unexpected-messy](https://unexpected.js.org/unexpected-messy/): Assertions for
   HTTP messages (requests and responses) and mails (rfc2822). Browser-compatible.
-* [unexpected-mitm](http://unexpected.js.org/unexpected-mitm/): Mock out HTTP
+* [unexpected-mitm](https://unexpected.js.org/unexpected-mitm/): Mock out HTTP
   and make assertions about the HTTP traffic that goes on while executing other
   assertions. Based on the [mitm](https://github.com/moll/node-mitm/) module.
   Only works with node.js and io.js.
-* [unexpected-moment](http://unexpected.js.org/unexpected-moment/):
-  Assertions for testing [moment.js](http://momentjs.com/) instances.
+* [unexpected-moment](https://unexpected.js.org/unexpected-moment/):
+  Assertions for testing [moment.js](https://momentjs.com/) instances.
 * [unexpected-preact](https://bruderstein.github.io/unexpected-preact/): Assertions for preact.js
-* [unexpected-react](http://bruderstein.github.io/unexpected-react): Assertions for React.js. Assert using JSX.
-* [unexpected-reaction](http://unexpected.js.org/unexpected-reaction/): An Unexpected plugin to make React testing with [unexpected-dom](https://munter.github.io/unexpected-dom/) more convenient.
-* [unexpected-resemble](http://unexpected.js.org/unexpected-resemble/): Image resemblance
-  assertions based on [resemble.js](http://huddle.github.io/Resemble.js/). Works in
+* [unexpected-react](https://bruderstein.github.io/unexpected-react): Assertions for React.js. Assert using JSX.
+* [unexpected-reaction](https://unexpected.js.org/unexpected-reaction/): An Unexpected plugin to make React testing with [unexpected-dom](https://munter.github.io/unexpected-dom/) more convenient.
+* [unexpected-resemble](https://unexpected.js.org/unexpected-resemble/): Image resemblance
+  assertions based on [resemble.js](https://rsmbl.github.io/Resemble.js/). Works in
   both node.js and the browser.
-* [unexpected-set](http://unexpected.js.org/unexpected-set/): Add support for [Set](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set) instances.
-* [unexpected-sinon](http://unexpected.js.org/unexpected-sinon/): Add support for
-  [sinon](http://sinonjs.org/) spies.
-* [unexpected-stream](http://unexpected.js.org/unexpected-stream/): Assertions for
+* [unexpected-set](https://unexpected.js.org/unexpected-set/): Add support for [Set](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set) instances.
+* [unexpected-sinon](https://unexpected.js.org/unexpected-sinon/): Add support for
+  [sinon](https://sinonjs.org/) spies.
+* [unexpected-stream](https://unexpected.js.org/unexpected-stream/): Assertions for
   node.js streams.
 * [unexpected-webdriver](https://github.com/fgnass/unexpected-webdriver): Assertions for Selenium WebDriver.
 * [unexpected-generator](https://github.com/gertsonderby/unexpected-generator): Assertions for ES2015 generators and iterators.