Rewind file in Storage::Fog if bucket does not exist

There was a bug in the code where if you created a bucket the file would
get read but not rewind on the first pass through (when the bucket
didn't exist). So when we went into the retry logic the file would
already be read and zero bytes would get copied over from the file. This
fixes that by rewinding the file during the retry so it gets correctly
copied over the second time around.

lib/paperclip/storage/fog.rb

@@ -117,6 +117,7 @@ module Paperclip
             raise if retried
             raise if retried
             retried = true
             retried = true
             directory.save
             directory.save
+            file.rewind
             retry
             retry
           ensure
           ensure
             file.rewind
             file.rewind

spec/paperclip/storage/fog_spec.rb

@@ -206,6 +206,11 @@ describe Paperclip::Storage::Fog do
           assert @dummy.save
           assert @dummy.save
           assert @connection.directories.get(@fog_directory)
           assert @connection.directories.get(@fog_directory)
         end
         end
+
+        it "sucessfully rewinds the file during bucket creation" do
+          assert @dummy.save
+          expect(Paperclip.io_adapters.for(@dummy.avatar).read.length).to be > 0
+        end
       end
       end
 
 
       context "with a bucket" do
       context "with a bucket" do