Updating Markdown dep
Merge pull request #141 from jwarwick/markdown_dep_update

Updating Markdown dep
Depend on Elixir v0.14.3
Add support for earmark, so we no longer rely on external markdown processors
use hex version of earmark
Add earmark test, and make hoedown tests optional
Merge pull request #142 from pragdave/master

Add earmark support to ex_doc
Add devinus/markdown for testing, include hex on builds
Pass --force to Hex