Merge branch 'refs/heads/patch-1' into develop
add -p to mkdir so no error if directory exists
add --force option to avoid errors, I was seeing an error that either the directory was already under version control or it wasn't
removes assets and trunk directories from the tagged directory

I found that I was getting /assets and /trunk included in my tag directory and this was being uploaded to wp.org. Worse was that it was being downloaded to every user.
Merge pull request #7 from afragen/patch-2

Fix issues with /assets directories