Remove markaby template, only use HTML template for bootstraping
Using HTML as template
Using FileUtils.mkdir_p to make dir tree, instead of mkdir
Using find to walk dir
Remove markaby markdown from Rakefile
Adjust cleaning tasks
Adjust creating tasks
Add var to control CSS & JS paths
Update render_file using predefined vars
Add get_css to renderer
Remove redundant comment @ Rakefile
Using Singleton (Renderer) for cleaner implementation
Move read_file to File.read_file @ utils
Why :try? Use :default as the default task
Add get_js
Refactor -> using get_assets to simplify get_css & get_js