updated bootstrap-slider to 10.6.2 (according to docs & package.json)

- updated bower.json
- updated package.json & package-lock.json
- added slider color options in build/less/miscellaneous.less
- updated bower_components
- updated pages/UI/sliders.html
- updated plugins files

bower.json

@@ -31,7 +31,6 @@
     "documentation"
   ],
   "dependencies": {
-    "bootstrap-slider": "bootstrap-slider#master",
     "chart.js": "^1.0",
     "ckeditor": "^4.7",
     "bootstrap-colorpicker": "^2.5.1",
@@ -57,7 +56,8 @@
     "jquery-sparkline": "^2.1.3",
     "font-awesome": "^4.7",
     "Ionicons": "ionicons#^2.0.1",
-    "jquery-ui": "1.11.4"
+    "jquery-ui": "1.11.4",
+    "seiyria-bootstrap-slider": "^10.6.2"
   },
   "resolutions": {
     "jquery": "^3.2.1"