Added a flag to allow building gh-pages-build.
Added a flag to allow building gh-pages-build.

Allows building it even if not in master branch.

lddubeau/wed,lddubeau/wed,mangalam-research/wed,lddubeau/wed,slattery/wed,slattery/wed,lddubeau/wed,mangalam-research/wed,mangalam-research/wed,slattery/wed,mangalam-research/wed