fix: remove usage of the deprecated helper._

Author: Matt Lewis

lib/preprocessor.js

@@ -9,6 +9,7 @@
 var istanbul = require('istanbul')
 var minimatch = require('minimatch')
 var path = require('path')
+var _ = require('lodash')
 var SourceMapConsumer = require('source-map').SourceMapConsumer
 var SourceMapGenerator = require('source-map').SourceMapGenerator
 var globalSourceCache = require('./source-cache')
@@ -22,7 +23,6 @@ var coverageObjRegex = /\{.*"path".*"fnMap".*"statementMap".*"branchMap".*\}/g
 
 // Preprocessor creator function
 function createCoveragePreprocessor (logger, helper, basePath, reporters, coverageReporter) {
-  var _ = helper._
   var log = logger.create('preprocessor.coverage')
 
   // Options

lib/reporter.js

@@ -13,6 +13,7 @@
 var path = require('path')
 var istanbul = require('istanbul')
 var minimatch = require('minimatch')
+var _ = require('lodash')
 
 var globalSourceCache = require('./source-cache')
 var coverageMap = require('./coverage-map')
@@ -28,7 +29,6 @@ function isAbsolute (file) {
 
 // TODO(vojta): inject only what required (config.basePath, config.coverageReporter)
 var CoverageReporter = function (rootConfig, helper, logger, emitter) {
-  var _ = helper._
   var log = logger.create('coverage')
 
   // Instance variables

package.json

@@ -19,8 +19,9 @@
   ],
   "author": "SATO taichi <ryushi@gmail.com>",
   "dependencies": {
-    "istanbul": "^0.4.0",
     "dateformat": "^1.0.6",
+    "istanbul": "^0.4.0",
+    "lodash": "^3.8.0",
     "minimatch": "^3.0.0",
     "source-map": "^0.5.1"
   },
@@ -47,7 +48,6 @@
     "karma-mocha": "1.x || ^0.2.0",
     "karma-requirejs": "1.x || ^0.2.2",
     "load-grunt-tasks": "^3.2.0",
-    "lodash": "^4.5.0",
     "mocha": "^2.2.5",
     "mocks": "0.0.15",
     "requirejs": "^2.1.20",