Make gemfile and fixtures.yml hidden files for the sake of module tool

.travis.yml

@@ -13,3 +13,4 @@ env:
   - PUPPET_VERSION=2.6.9
 notifications:
   email: false
+gemfile: .gemfile

Rakefile

@@ -17,7 +17,7 @@ end
 
 def fixtures(category)
   begin
-    fixtures = YAML.load_file("fixtures.yml")["fixtures"]
+    fixtures = YAML.load_file(".fixtures.yml")["fixtures"]
   rescue Errno::ENOENT
     return {}
   end