add Ace
Add markdown
Add github-markdown-css
Change markdown compiler
Add a example page #1
Merge pull request #3 from ww24/live-preview

Live preview
Add Gulp and build script
Update README
Add bootstrap buttons #2
Add test and fix code
Add Travis CI settings
Replace submodules
Fix Travis CI settings
Change submodule url
Add coverage tool
fix test settings
add coverage tools
Merge pull request #5 from ww24/develop

Develop