Cleanup ruby code via rubocop

This commit will add code cleanup as corrected
and alerted by rubocop. It also adds rules to
execute rubocop on Travis.

lib/facter/java_libjvm_path.rb

@@ -11,7 +11,7 @@
 # Notes:
 #   None
 Facter.add(:java_libjvm_path) do
-  confine :kernel => [ "Linux", "OpenBSD" ]
+  confine kernel: %w[Linux OpenBSD]
   setcode do
     java_default_home = Facter.value(:java_default_home)
     java_libjvm_file = Dir.glob("#{java_default_home}/jre/lib/**/libjvm.so")
@@ -22,4 +22,3 @@ Facter.add(:java_libjvm_path) do
     end
   end
 end
-