Updated devDependencies

Was planning on doing this after 0.11 (see #497), but since I'm doing an overhaul of the development files now instead, might as well...

package.json

@@ -57,23 +57,24 @@
     "parser": "gulp parser"
   },
   "devDependencies": {
-    "babel-preset-es2015": "6.14.0",
-    "babelify": "7.3.0",
-    "browserify": "13.1.0",
-    "chai": "3.5.0",
-    "del": "2.2.2",
+    "babel-preset-es2015": "6.24.1",
+    "babel-core": "6.26.0",
+    "babelify": "8.0.0",
+    "browserify": "14.5.0",
+    "chai": "4.1.2",
+    "del": "3.0.0",
     "eslint-config-dmajda": "1.0.0",
-    "express": "4.14.0",
-    "glob": "7.0.6",
+    "express": "4.16.2",
+    "glob": "7.1.2",
     "gulp": "3.9.1",
-    "gulp-eslint": "3.0.1",
-    "gulp-header": "1.8.8",
-    "gulp-mocha": "3.0.1",
+    "gulp-eslint": "4.0.0",
+    "gulp-header": "1.8.9",
+    "gulp-mocha": "4.3.1",
     "gulp-rename": "1.2.2",
-    "gulp-uglify": "2.0.0",
-    "morgan": "1.7.0",
-    "run-sequence": "1.2.2",
-    "sinon": "1.17.6",
+    "gulp-uglify": "3.0.0",
+    "morgan": "1.9.0",
+    "run-sequence": "2.2.0",
+    "sinon": "4.0.1",
     "vinyl-buffer": "1.0.0",
     "vinyl-source-stream": "1.1.0"
   },