Add Sentry error tracking

Gemfile

@@ -3,5 +3,6 @@ source 'https://rubygems.org'
 gem 'dotenv',             '~> 2.0.2'
 gem 'mrkt',               '~> 0.6.0'
 gem 'full-name-splitter', '~> 0.1.2'
+gem 'sentry-raven',       '~> 0.15'
 gem 'sinatra',            '~> 1.4.6', require: 'sinatra/base'
 gem 'unicorn'

Gemfile.lock

@@ -15,6 +15,8 @@ GEM
     rack-protection (1.5.3)
       rack
     raindrops (0.15.0)
+    sentry-raven (0.15.6)
+      faraday (>= 0.7.6)
     sinatra (1.4.6)
       rack (~> 1.4)
       rack-protection (~> 1.4)
@@ -32,8 +34,9 @@ DEPENDENCIES
   dotenv (~> 2.0.2)
   full-name-splitter (~> 0.1.2)
   mrkt (~> 0.6.0)
+  sentry-raven (~> 0.15)
   sinatra (~> 1.4.6)
   unicorn
 
 BUNDLED WITH
-   1.10.6
+   1.11.2

config.ru

@@ -3,5 +3,14 @@ require 'bundler'
 Bundler.require
 Dotenv.load(".env.#{ENV['RACK_ENV']}", '.env')
 
+
+if ENV['RAVEN_DSN']
+  Raven.configure(true) do |config|
+    config.dsn = ENV['RAVEN_DSN']
+  end
+
+  use Raven::Rack
+end
+
 require './app'
 run MarketoTools