Add invalid paths in SUMMARY.md fixture

To test for correct path normalization
Improve path normalization when parsing SUMMARY.md
Fix #345: Improve navigation on dark theme
Support generating a plugin's book info dynamically
Fix minor issues with new plugin additions
Bump version to 0.6.2
Add changelogs for 0.6.2
Fix resource normalization in when loading plugins

Fixes #384
Bump version to 0.6.3
Remove github count stars and watchers
Fix font settings apply
Replace "marked" with "kramed"
Switch to graceful-fs, fix #373
add sharing to weibo.com.
google、facebook and twitter are block by GFW in China，Chinese can
not visit these websites.
add 'weibo' config in option links.sharing,the share link will not be
used by default,users should set the value of 'weibo' to true to turn
on sharing to weibo.com.
Merge pull request #386 from codepiano/china-social-network-sharing

add sharing to weibo.com.
Add comments to default introduction chapter code

Fixes #388
Use marked-text-renderer@0.1.0
Fix #278: Add page break between chapters/articles
Bump version to 0.7.0
Add changes for 0.7.0