Dependency Updates

This change updates the dependencies of the buildpack.  It makes some
changes to the code in order to accommodate Rubocop.

Author: nebhale

.rubocop.yml

@@ -26,6 +26,8 @@ RSpec/FilePath:
   Enabled: false
 Style/Documentation:
   Enabled: false
+Style/EmptyLinesAroundBlockBody:
+  Enabled: false
 Style/EmptyLinesAroundClassBody:
   Enabled: false
 Style/EmptyLinesAroundModuleBody:

Gemfile.lock

@@ -18,7 +18,7 @@ GEM
     powerpack (0.0.9)
     rainbow (2.0.0)
     rake (10.4.2)
-    redcarpet (3.2.1)
+    redcarpet (3.2.2)
     rspec (3.1.0)
       rspec-core (~> 3.1.0)
       rspec-expectations (~> 3.1.0)
@@ -31,7 +31,7 @@ GEM
     rspec-mocks (3.1.3)
       rspec-support (~> 3.1.0)
     rspec-support (3.1.2)
-    rubocop (0.27.1)
+    rubocop (0.28.0)
       astrolabe (~> 1.3)
       parser (>= 2.2.0.pre.7, < 3.0)
       powerpack (~> 0.0.6)

lib/java_buildpack/util/start_script.rb

@@ -25,16 +25,14 @@ module Util
     # @param [Pathname] root the root to search from
     # @return [Pathname, nil] the start script or +nil+ if one does not exist
     def start_script(root)
-      if root
-        candidates = (root + 'bin/*').glob
+      return nil unless root
 
-        if candidates.size == 1
-          candidates.first
-        else
-          candidates.find { |candidate| Pathname.new("#{candidate}.bat").exist? }
-        end
+      candidates = (root + 'bin/*').glob
+
+      if candidates.size == 1
+        candidates.first
       else
-        nil
+        candidates.find { |candidate| Pathname.new("#{candidate}.bat").exist? }
       end
     end