Update npm dependencies and config

Author: azu

.babelrc

@@ -1,4 +1,15 @@
 {
-    "presets": ["es2015"],
-    "plugins": ["add-module-exports"]
+  "presets": [
+    "es2015"
+  ],
+  "plugins": [
+    "add-module-exports"
+  ],
+  "env": {
+    "development": {
+      "presets": [
+        "power-assert"
+      ]
+    }
+  }
 }

package.json

@@ -9,22 +9,23 @@
   },
   "dependencies": {
     "kuromojin": "^1.1.0",
-    "sentence-splitter": "^1.2.0",
+    "sentence-splitter": "^2.0.0",
     "textlint-rule-helper": "^1.1.5",
     "textlint-util-to-string": "^1.2.0"
   },
   "devDependencies": {
     "babel-cli": "^6.5.1",
-    "babel-plugin-add-module-exports": "^0.1.2",
+    "babel-plugin-add-module-exports": "^0.2.0",
     "babel-preset-es2015": "^6.5.0",
-    "espower-babel": "^4.0.1",
+    "babel-preset-power-assert": "^1.0.0",
+    "babel-register": "^6.8.0",
     "mocha": "^2.4.5",
-    "power-assert": "^1.2.0",
-    "textlint": "^5.2.1",
-    "textlint-tester": "^0.4.1"
+    "power-assert": "^1.4.0",
+    "textlint": "^6.6.0",
+    "textlint-tester": "^1.2.0"
   },
   "scripts": {
-    "build": "babel src --out-dir lib --source-maps",
+    "build": "NODE_ENV=production babel src --out-dir lib --source-maps",
     "watch": "babel src --out-dir lib --watch --source-maps",
     "prepublish": "npm run --if-present build",
     "test": "mocha",

test/mocha.opts

@@ -1 +1 @@
---compilers js:espower-babel/guess
+--compilers js:babel-register