feat(datepicker): change css to scss, add own styles (#2478)

- changed css file to scss
- added mixin for theming and variables files
- added own classes for theming

Breaks `.label-success`(and same labels), was removed (use `.theme-green`, `theme-red` etc. instead, full-list in variables.scss)

Author: EvilAlexei

.angular-cli.json

@@ -18,7 +18,7 @@
       "prefix": "",
       "mobile": false,
       "styles": [
-        "../../src/datepicker/bs-datepicker.css"
+        "../../src/datepicker/bs-datepicker.scss"
       ],
       "scripts": [],
       "environmentSource": "environments/environment.ts",
@@ -41,7 +41,7 @@
     }
   },
   "defaults": {
-    "styleExt": "css",
+    "styleExt": "scss",
     "prefixInterfaces": false,
     "inline": {
       "style": false,

.gitignore

@@ -35,6 +35,7 @@ Thumbs.db
 
 /demo/e2e/*.js
 /demo/e2e/*.map
+/demo/src/ng-api-doc.ts
 src/**/*.js
 src/**/*.map
 scripts/**/*.js