fix compatiblity with org-mode 8.0 (ox-html)
Merge branch 'org-mode-8.0' of https://github.com/jianingy/org-jekyll into org-mode-8.0
add a new function: org-jekyll-export-project
Merge pull request #7 from jianingy/org-mode-8.0

add a new function: org-jekyll-export-project
Merged and made work with org-mode 8