Really remove the sinon and chai boilerplate

It turns out we don't need Sinon-Chai because we only use the assert
interface. According to the Sinon-Chai docs:

    For assert interface there is no need for this library.

Instead, we just install the assertions into the assert object.

h/static/scripts/annotator/test/guest-test.coffee

@@ -4,10 +4,6 @@ Guest = require('../guest')
 anchoring = require('../anchoring/html')
 highlighter = require('../highlighter')
 
-assert = chai.assert
-sinon.assert.expose(assert, prefix: '')
-
-
 waitForSync = (annotation) ->
   if annotation.$anchors?
     return Promise.resolve()

h/static/scripts/annotator/test/highlighter-test.coffee

@@ -3,10 +3,6 @@ $ = Annotator.$
 
 highlighter = require('../highlighter')
 
-assert = chai.assert
-sinon.assert.expose(assert, prefix: '')
-
-
 describe "highlightRange", ->
   it 'wraps a highlight span around the given range', ->
     txt = document.createTextNode('test highlight span')

h/static/scripts/directive/test/simple-search-test.coffee

 {module, inject} = require('angular-mock')
 
-assert = chai.assert
-
-
 describe 'simple-search', ->
   $compile = null
   $element = null
@@ -50,15 +47,15 @@ describe 'simple-search', ->
     isolate.searchtext = "Test query"
     isolate.$digest()
     $element.find('form').triggerHandler('submit')
-    sinon.assert.calledWith($scope.update, "Test query")
+    assert.calledWith($scope.update, "Test query")
 
   it 'invokes callbacks when the input model changes', ->
     $scope.query = "Test query"
     $scope.$digest()
-    sinon.assert.calledOnce($scope.update)
+    assert.calledOnce($scope.update)
     $scope.query = ""
     $scope.$digest()
-    sinon.assert.calledOnce($scope.clear)
+    assert.calledOnce($scope.clear)
 
   it 'adds a class to the form when there is no input value', ->
     $form = $element.find('.simple-search-form')

h/static/scripts/filter/test/persona-test.js

@@ -2,9 +2,6 @@ var angularMock = require('angular-mock');
 var module = angularMock.module;
 var inject = angularMock.inject;
 
-var assert = chai.assert;
-sinon.assert.expose(assert, {prefix: null});
-
 describe('persona', function () {
   var filter = null;
   var term = 'acct:hacker@example.com';

h/static/scripts/filter/test/urlencode-test.js

@@ -2,9 +2,6 @@ var angularMock = require('angular-mock');
 var module = angularMock.module;
 var inject = angularMock.inject;
 
-var assert = chai.assert;
-sinon.assert.expose(assert, {prefix: null});
-
 describe('urlencode', function () {
   var filter = null;
 

h/static/scripts/karma.config.js

@@ -12,7 +12,8 @@ module.exports = function(config) {
     frameworks: [
       'browserify',
       'mocha',
-      'chai-sinon'
+      'chai',
+      'sinon'
     ],
 
     // list of files / patterns to load in the browser
@@ -40,6 +41,7 @@ module.exports = function(config) {
       // Test deps
       'vendor/angular-mocks.js',
       '../../templates/client/*.html',
+      'test/bootstrap.js',
 
       // Tests
       '**/*-test.coffee',

h/static/scripts/test/blocklist-test.js

 describe('parseUrl', function () {
   'use strict';
 
-  var assert = chai.assert;
   var blocklist = require('../blocklist');
   var parseUrl = blocklist.parseUrl;
 

h/static/scripts/test/bootstrap.js

+// Expose the sinon assertions.
+sinon.assert.expose(assert, {prefix: null});

h/static/scripts/test/features-test.js

@@ -2,10 +2,6 @@
 
 var mock = require('angular-mock');
 
-var assert = chai.assert;
-sinon.assert.expose(assert, {prefix: null});
-
-
 describe('h:features', function () {
   var $httpBackend;
   var features;

h/static/scripts/test/form-respond-test.coffee

 {module, inject} = require('angular-mock')
-
-assert = chai.assert
 angular = require('angular')
 
 

h/static/scripts/test/tags-test.coffee

 {module, inject} = require('angular-mock')
 
-assert = chai.assert
-
 describe 'tags', ->
   TAGS_LIST_KEY = 'hypothesis.user.tags.list'
   TAGS_MAP_KEY = 'hypothesis.user.tags.map'

h/static/scripts/test/time-test.coffee

 {module, inject} = require('angular-mock')
 
-assert = chai.assert
-
 minute = 60
 hour = minute * 60
 day = hour * 24

package.json

@@ -29,11 +29,12 @@
     "jscs": "^1.13.1",
     "karma": "^0.12.17",
     "karma-browserify": "^3.0.3",
-    "karma-chai-sinon": "^0.1.5",
+    "karma-chai": "^0.1.0",
     "karma-cli": "0.0.4",
     "karma-mocha": "^0.1.4",
     "karma-ng-html2js-preprocessor": "^0.1.0",
     "karma-phantomjs-launcher": "^0.1.4",
+    "karma-sinon": "^1.0.4",
     "mocha": "^1.20.1",
     "phantomjs": "^1.9.7",
     "sinon": "^1.15.4",