Merge pull request #1103 from consul/invisible-captcha

Replace simple_captcha with invisible_captcha

Gemfile.lock

@@ -202,6 +202,8 @@ GEM
       terminal-table (>= 1.5.1)
     initialjs-rails (0.2.0.1)
       railties (>= 3.1, < 5.0)
+    invisible_captcha (0.8.2)
+      rails
     jquery-rails (4.1.1)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
@@ -365,8 +367,6 @@ GEM
       nokogiri (>= 1.4.0)
       nori (~> 2.4)
       wasabi (~> 3.4)
-    simple_captcha2 (0.4.0)
-      rails (>= 4.1)
     simplecov (0.11.2)
       docile (~> 1.1.0)
       json (~> 1.8)
@@ -469,6 +469,7 @@ DEPENDENCIES
   groupdate
   i18n-tasks
   initialjs-rails (= 0.2.0.1)
+  invisible_captcha (~> 0.8.2)
   jquery-rails
   jquery-ui-rails
   kaminari
@@ -492,7 +493,6 @@ DEPENDENCIES
   rspec-rails (~> 3.3)
   sass-rails (~> 5.0, >= 5.0.4)
   savon
-  simple_captcha2
   social-share-button!
   spring
   spring-commands-rspec