add back ruby-prof in Gemfile

debian/patches/0100-remove-development-test.patch

@@ -2,7 +2,7 @@ Bundler will fail when it can't find these locally
 
 --- a/Gemfile
 +++ b/Gemfile
-@@ -245,96 +245,12 @@
+@@ -245,88 +245,6 @@
    gem 'influxdb', '~> 0.2', require: false
  end
  
@@ -91,11 +91,3 @@ Bundler will fail when it can't find these locally
  gem 'octokit', '~> 4.3'
  
  gem 'mail_room', '~> 0.8'
- 
- gem 'email_reply_parser', '~> 0.5.8'
- 
--gem 'ruby-prof', '~> 0.15.9'
--
- ## CI
- gem 'activerecord-session_store', '~> 1.0'
- gem 'nested_form', '~> 0.3.2'