Update to support optional email register and signin

package.json

@@ -18,10 +18,12 @@
     "blueimp-md5": "^2.4.0",
     "body-parser": "^1.15.2",
     "bootstrap": "^3.3.7",
+    "bootstrap-validator": "^0.11.5",
     "chance": "^1.0.4",
     "cheerio": "^0.22.0",
     "codemirror": "git+https://github.com/hackmdio/CodeMirror.git",
     "compression": "^1.6.2",
+    "connect-flash": "^0.1.1",
     "connect-session-sequelize": "^3.2.0",
     "cookie": "0.3.1",
     "cookie-parser": "1.4.3",
@@ -84,6 +86,7 @@
     "passport-github": "^1.1.0",
     "passport-gitlab2": "^2.2.0",
     "passport-google-oauth20": "^1.0.0",
+    "passport-local": "^1.0.0",
     "passport-twitter": "^1.0.4",
     "passport.socketio": "^3.6.2",
     "pdfobject": "^2.0.201604172",
@@ -95,6 +98,7 @@
     "request": "^2.75.0",
     "reveal.js": "^3.3.0",
     "sequelize": "^3.24.3",
+    "scrypt": "^6.0.3",
     "select2": "^3.5.2-browserify",
     "sequelize-cli": "^2.4.0",
     "sharp": "^0.16.2",
@@ -109,6 +113,7 @@
     "to-markdown": "^3.0.1",
     "toobusy-js": "^0.5.1",
     "uws": "^0.11.0",
+    "validator": "^6.2.0",
     "velocity-animate": "^1.3.1",
     "visibilityjs": "^1.2.4",
     "viz.js": "^1.3.0",