simplifies compile assets

this refactoring prevents also the burn of generators which
was imported with fix posativ/acrylamid#96
Merge pull request #98 from chripo/compileassets

simplifies compile assets
First attempt at vanilla Pandoc parsing
convert tabs to spaces
add test for pandocstyle
try pandoc when METASTYLE is set to 'native' first
make author and date in pandoc block optional
add link relationships to themes
sets html lang to enty.lang if available
Merge pull request #102 from chripo/enrichmeta

enrich meta
document pandoc title block and add @dpritchard to AUTHORS
Merge pull request #101 from posativ/pandoc-recognition

Pandoc title block recognition