[Document] add form components english document (#199)

* [Document] add english document of Checkbox

* [Document] add english document of Field

* [Document] add english document of NumberKeyboard

* [bugfix] NumberKeyboard should not dispaly title when title is empty

* [Document] add english document of PasswordInput

* [Document] add english document of Radio

* [document] add english document of Switch

* [bugfix] remove redundent styles in english document

* [Document] fix details

* fix Switch test cases

package.json

@@ -104,20 +104,20 @@
     "run-sequence": "^2.1.0",
     "sinon": "^2.4.1",
     "sinon-chai": "^2.12.0",
-    "style-loader": "^0.18.2",
+    "style-loader": "^0.19.0",
     "uppercamelcase": "^3.0.0",
-    "url-loader": "^0.5.9",
+    "url-loader": "^0.6.2",
     "vue": "^2.4.2",
-    "vue-loader": "^13.0.4",
+    "vue-loader": "^13.3.0",
     "vue-markdown-loader": "^2.1.0",
-    "vue-router": "^2.7.0",
+    "vue-router": "^3.0.0",
     "vue-sfc-compiler": "^0.0.2",
     "vue-style-loader": "^3.0.0",
     "vue-template-compiler": "^2.4.2",
-    "webpack": "^3.5.5",
+    "webpack": "^3.7.1",
     "webpack-bundle-analyzer": "^2.9.0",
     "webpack-dev-server": "^2.7.1",
     "webpack-merge": "^4.1.0",
-    "zan-doc": "^0.3.5"
+    "zan-doc": "^0.3.6"
   }
 }