read package.json with require
fixed maxOpenFile variable
Added "default_category" setting
Replace the old "category_dir" and the new one will be the link of category archives
Fixed category path
Merge branch 'dev'
0.5.4 release
Escape special characters in category, tag and post file name #66
New setting: category_map, tag_map
Rewrite YAML front matter
The first "---" can be ignored
Remove the first "---" in posts
Updated tests
Refs #64
    - add the light theme submodule