recursively include files in asciidoc
recursively include files in asciidoc

Port recursive expansion into the preindex task.

mosoft521/gitscm-next,git/git-scm.com,jasonlong/git-scm.com,jasonlong/git-scm.com,git/git-scm.com,Mokolea/git-scm.com,git/git-scm.com,Mokolea/git-scm.com,git/git-scm.com,Mokolea/git-scm.com,jasonlong/git-scm.com,jnavila/gitscm-next,Mokolea/git-scm.com,mosoft521/gitscm-next,jnavila/gitscm-next,jasonlong/git-scm.com,jnavila/gitscm-next,mosoft521/gitscm-next,mosoft521/gitscm-next,jnavila/gitscm-next