[Improvement] optimize build speed (#355)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

* [Doc] translate theme & demo pages

* [Doc] add Internationalization document

* [bugfix] remove unnecessary props

* [fix] optimize clickoutside

* [new feature] optimize find-parent

* [new feature]: change document title accordinng to language

* [new feature] Pagination code review

* [improvement] adjust icon-font unicode

* [improvement] Icon spinner color inherit

* [improvement] icon default width

* [bugfix] DateTimePicker validate date props

* [bugfix] Tab item text ellipsis

* [improvement] optimize single line ellipsis

* [Improvement] optimzie staticClass

* [Improvement] Button: use sfc instread of jsx

* [Improvement] update actionsheet close icon style

* fix: yarn.lock

* fix: icon test cases

* [bugfix] errors during ssr

* [Improvement] SubmitBar add left slot

* [new feature] ImagePreview support manually close

* fix: ImagePreview test case

* [Doc] add switch lang button in mobile

* [bugfix] Popup overlay style update

* [bugfix] NavBar click event

* [Improvement] optimize build speed

package.json

@@ -70,6 +70,7 @@
     "dependency-tree": "^5.12.0",
     "eslint-plugin-vue": "^2.1.0",
     "extract-text-webpack-plugin": "2.0.0",
+    "fast-vue-md-loader": "^1.0.2",
     "felint": "^0.5.0-alpha.3",
     "file-save": "^0.2.0",
     "friendly-errors-webpack-plugin": "^1.6.1",
@@ -95,7 +96,7 @@
     "postcss": "^6.0.14",
     "postcss-calc": "^6.0.0",
     "postcss-easy-import": "^3.0.0",
-    "postcss-loader": "^2.0.8",
+    "postcss-loader": "^2.0.9",
     "precss": "2.0.0",
     "progress-bar-webpack-plugin": "^1.10.0",
     "rimraf": "^2.5.4",
@@ -108,7 +109,6 @@
     "vant-doc": "0.3.18",
     "vue": "^2.5.8",
     "vue-loader": "^13.5.0",
-    "vue-markdown-loader": "^2.3.0",
     "vue-router": "^3.0.1",
     "vue-sfc-compiler": "^0.0.5",
     "vue-style-loader": "^3.0.0",