Add License Finder gem.

In order to rehost all our gems in our own gem host, we need to have the legal rights to do so for every gem should they be taken down from RubyGems. License Finder automates checking of gems to ensure that we're in the clear legally.

Approved the MIT License because it essentially allows us to do "whatever" with those gems.

I am not a lawyer.

https://github.com/pivotal/LicenseFinder

Gemfile

@@ -306,6 +306,8 @@ group :development, :test do
   gem 'bundler-audit', require: false
 
   gem 'benchmark-ips', require: false
+
+  gem "license_finder", require: false
 end
 
 group :test do

Gemfile.lock

@@ -366,6 +366,12 @@ GEM
       actionmailer (>= 3.2)
       letter_opener (~> 1.0)
       railties (>= 3.2)
+    license_finder (2.1.0)
+      bundler
+      httparty
+      rubyzip
+      thor
+      xml-simple
     licensee (8.0.0)
       rugged (>= 0.24b)
     listen (3.0.5)
@@ -618,6 +624,7 @@ GEM
       sexp_processor (~> 4.1)
     rubyntlm (0.5.2)
     rubypants (0.2.0)
+    rubyzip (1.2.0)
     rufus-scheduler (3.1.10)
     rugged (0.24.0)
     safe_yaml (1.0.4)
@@ -875,6 +882,7 @@ DEPENDENCIES
   jwt
   kaminari (~> 0.17.0)
   letter_opener_web (~> 1.3.0)
+  license_finder
   licensee (~> 8.0.0)
   loofah (~> 2.0.3)
   mail_room (~> 0.7)