add twitter and google oauth login

Gemfile.lock

@@ -52,8 +52,14 @@ GEM
     coffee-script-source (1.10.0)
     concurrent-ruby (1.0.2)
     debug_inspector (0.0.2)
+    dotenv (2.1.1)
+    dotenv-rails (2.1.1)
+      dotenv (= 2.1.1)
+      railties (>= 4.0, < 5.1)
     erubis (2.7.0)
     execjs (2.7.0)
+    faraday (0.9.2)
+      multipart-post (>= 1.2, < 3)
     ffi (1.9.14)
     globalid (0.3.7)
       activesupport (>= 4.1.0)
@@ -66,6 +72,8 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
+    json (1.8.3)
+    jwt (1.5.6)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -80,12 +88,35 @@ GEM
     mini_portile2 (2.1.0)
     minitest (5.9.1)
     multi_json (1.12.1)
+    multi_xml (0.5.5)
+    multipart-post (2.0.0)
     nio4r (1.2.1)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
+    oauth (0.5.1)
+    oauth2 (1.2.0)
+      faraday (>= 0.8, < 0.10)
+      jwt (~> 1.0)
+      multi_json (~> 1.3)
+      multi_xml (~> 0.5)
+      rack (>= 1.2, < 3)
     omniauth (1.3.1)
       hashie (>= 1.2, < 4)
       rack (>= 1.0, < 3)
+    omniauth-google-oauth2 (0.4.1)
+      jwt (~> 1.5.2)
+      multi_json (~> 1.3)
+      omniauth (>= 1.1.1)
+      omniauth-oauth2 (>= 1.3.1)
+    omniauth-oauth (1.1.0)
+      oauth
+      omniauth (~> 1.0)
+    omniauth-oauth2 (1.4.0)
+      oauth2 (~> 1.0)
+      omniauth (~> 1.2)
+    omniauth-twitter (1.2.1)
+      json (~> 1.3)
+      omniauth-oauth (~> 1.1)
     puma (3.6.0)
     rack (2.0.1)
     rack-test (0.6.3)
@@ -164,10 +195,13 @@ DEPENDENCIES
   bigbluebutton-api-ruby
   byebug
   coffee-rails (~> 4.2)
+  dotenv-rails
   jbuilder (~> 2.5)
   jquery-rails
   listen (~> 3.0.5)
   omniauth
+  omniauth-google-oauth2
+  omniauth-twitter
   puma (~> 3.0)
   rails (~> 5.0.0, >= 5.0.0.1)
   sass-rails (~> 5.0)