added bootstrap-switch

- updated package.json
- updated build/npm/Plugins.js
- added build/scss/plugins/_bootstrap-switch.scss with bootstrap 4 style & color overrides
- updated pages/forms/advanced.html with bootstrap switch demo & added rows in icheck demo
- added plugins files

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "admin-lte",
-  "version": "3.0.0-beta.2",
+  "version": "3.0.0-rc.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -3228,6 +3228,11 @@
       "resolved": "https://registry.npmjs.org/bootstrap-slider/-/bootstrap-slider-10.6.2.tgz",
       "integrity": "sha512-8JTPZB9QVOdrGzYF3YgC3YW6ssfPeBvBwZnXffiZ7YH/zz1D0EKlZvmQsm/w3N0XjVNYQEoQ0ax+jHrErV4K1Q=="
     },
+    "bootstrap-switch": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/bootstrap-switch/-/bootstrap-switch-3.4.0.tgz",
+      "integrity": "sha512-P4Qdx7mLjqgilKQeeuDCf8AHWeO7992+NFfh0doAA/ExaJqr02QFHhq18GL8EYd2XRviJ16pUUyMRsfOVaPEVg=="
+    },
     "bootstrap4-duallistbox": {
       "version": "4.0.1",
       "resolved": "github:istvan-ujjmeszaros/bootstrap-duallistbox#b3295efa2dc1ca6d6f14531ee0f073c3a45e554f"