Merge pull request #129 from chyndman/sundown-windows-nmake

Sundown uses nmake on Windows
Fix support for custom formatters
Merge pull request #132 from alco/formatter-fix

Fix support for custom formatters
Use new docs structure in ex_doc
Provide an alternative to sundown in the form of pandoc
Look for available markdown processors before generating docs
Fix some implementation issues
Merge pull request #133 from alco/pandoc

Pandoc
Add devinus/markdown dependency and bump to v0.5.0-dev
Make directory structure mimic namespace
Remove use of deprecated functions
Update to latest markdown
Fetch dependencies on travis builds
Update markdown dependency
Updating deprecated size calls
Merge pull request #134 from jwarwick/size_deprecated

Updating deprecated size calls
Support arbitrary formatter options