CSS: Install dependencies for SCSS Integration.

This commit installs the dependencies required for SCSS compilation
by webpack.

package.json

@@ -9,11 +9,13 @@
     "@types/webpack": "4.1.3",
     "blueimp-md5": "2.10.0",
     "clipboard": "2.0.0",
+    "css-loader": "0.28.11",
     "emoji-datasource-apple": "3.0.0",
     "emoji-datasource-emojione": "3.0.0",
     "emoji-datasource-google": "3.0.0",
     "emoji-datasource-twitter": "3.0.0",
     "expose-loader": "0.7.5",
+    "file-loader": "1.1.11",
     "flatpickr": "4.2.3",
     "fuzzysearch": "1.0.3",
     "handlebars": "4.0.10",
@@ -25,15 +27,19 @@
     "jquery": "3.3.1",
     "jquery-validation": "1.16.0",
     "katex": "0.8.3",
+    "mini-css-extract-plugin": "0.4.0",
     "moment": "2.21.0",
     "moment-timezone": "0.5.14",
+    "node-sass": "4.8.3",
     "perfect-scrollbar": "1.3.0",
     "plotly.js": "1.19.2",
+    "sass-loader": "7.0.1",
     "script-loader": "0.7.2",
     "source-map-loader": "0.2.3",
     "string.prototype.codepointat": "0.2.0",
     "string.prototype.endswith": "0.2.0",
     "string.prototype.startswith": "0.2.0",
+    "style-loader": "0.21.0",
     "to-markdown": "3.1.0",
     "ts-loader": "4.2.0",
     "ts-node": "3.3.0",

version.py

@@ -8,4 +8,4 @@ ZULIP_VERSION = "1.8.0+git"
 # Typically, adding a dependency only requires a minor version bump, and
 # removing a dependency requires a major version bump.
 
-PROVISION_VERSION = '19.1'
+PROVISION_VERSION = '19.2'