[doc] transaction and data safety, closes #903
Merge pull request #904 from tiger-seo/master

[Uploadable] Add UploadableFileName annotation
[Sortable] Move an item at the end of the list

See also: http://stackoverflow.com/questions/14688469/ordering-entities-with-sortable-behavior-in-doctrine-2-symfony-2/20092238#20092238

I've added to the Sortable documentation how to move an item to the end of the list.

However I have not tested this behavior, can you confirm that this is correct?
Updated formatting in README
Merge pull request #909 from myclabs/readme

Updated formatting in README
Merge pull request #910 from tiger-seo/master

[Uploadable] Add UploadableFileName annotation (fixes)
Merge pull request #907 from mnapoli/patch-1

[Sortable] Move an item at the end of the list