Add workflow/other for cloning issue with git flow

[damian-romero]

Add documentation about initializing gitflow from a cloned repo:

gitflow fails sometimes when cloning a repository and trying to initialize. See nvie/gitflow#121

Here is a workaround:

$ git checkout master
$ git checkout develop
$ git branch -a
* develop
  master
  remotes/origin/HEAD -> origin/develop
  remotes/origin/develop
  remotes/origin/master
$ git init

[damian-romero]

Closed in PR #33