Suppress net protocol errors (#1015)

Gemfile

@@ -30,6 +30,8 @@ gem 'ice_cube'
 gem 'inherited_resources'
 gem 'kaminari'
 gem 'mysql2'
+gem 'net-ftp'
+gem 'net-http'
 gem 'prawn'
 gem 'prawn-table'
 gem 'puma'

Gemfile.lock

@@ -332,6 +332,11 @@ GEM
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     mysql2 (0.5.4)
+    net-ftp (0.2.0)
+      net-protocol
+      time
+    net-http (0.3.2)
+      uri
     net-imap (0.3.4)
       date
       net-protocol
@@ -562,6 +567,8 @@ GEM
       rack (>= 1.0.0)
     thor (1.2.2)
     tilt (2.0.11)
+    time (0.2.2)
+      date
     timeout (0.3.1)
     ttfunk (1.7.0)
     twitter-bootstrap-rails (2.2.8)
@@ -578,6 +585,7 @@ GEM
     unf_ext (0.0.8.2)
     unicode-display_width (2.4.2)
     uniform_notifier (1.16.0)
+    uri (0.10.0.2)
     web-console (4.2.0)
       actionview (>= 6.0.0)
       activemodel (>= 6.0.0)
@@ -646,6 +654,8 @@ DEPENDENCIES
   midi-smtp-server
   mime-types
   mysql2
+  net-ftp
+  net-http
   prawn
   prawn-table
   pry-rescue