am 00a218a9: am 14e066d5: am 4ec62cee: am 40de3237: add support for custom <head> tags in each file with page.customHeadTag HDF var

* commit '00a218a9c818fd69b8f43b950109183d13f01296':
  add support for custom <head> tags in each file with page.customHeadTag HDF var