core.detect returns None if many=False and no renderers are detected
Merge branch 'feat/api-changes' into dev
core.detect returns single handler by default
Add support for Markdown.

Requires python-markdown.
Fix requirement file for markdown
Enabled Handler for Markdown
Improved tests for mfr_md

Added test for __init__.py for 100% coverage
Updated markdown.md test file.

More pleasing to the eye.
Improved style to meet pep8
Merge pull request #58 from tkb608/md

Add support for Markdown.
core.detect returns an instance by default
Debug messages if something goes wrong, instead of just internal server error
Fix static url
Update docs
Merge branch 'dev' of https://github.com/CenterForOpenScience/modular-file-renderer into dev
Merge pull request #61 from linse/feature/dev-improvements

Debug messages if something goes wrong, instead of just internal server ...
Update gitignore
Remove previewer files
Merge remote-tracking branch 'origin/dev' into dev
Update docs