Add benchmark script
skip_style and skipt_html options
Control features
Clean def_footnotes for BlockLexer
Use cached Markdown for testing
Makefile and travis ci
Fix on escape html
Pop item out
Add extra tests for configuration
New way for generating footnotes. Use footnote_start and footnote_end
token.

https://github.com/chjj/marked/pull/351
https://github.com/chjj/marked/commit/abe526268ca5445c91234ea5b3b81b3627ed56e7