only ignore dist directory in root path
ignore dotfiles when spm doc build
update nprogress in doc theme
improve history page style
upgrade normalize.css
history cdn url
Merge github.com:spmjs/spm
update favicon url
update nprogress
fix #832 again
Merge pull request #966 from afc163/master

ignore dist 文件夹的问题以及一些样式更新