fixing issue#225(deprecation...) by:
1,_config.yml; change "pygments: true" to "highlighter: pygments"
2,rss.xml&atom.xml; change "Layout: nil" to "Layout: null"
Merge pull request #226 from PetersonLian/master

fixing issue#225(deprecation warning)
Cleanup and reorganize config
Activate Jekyll Plugins for GitHub Pages and uses jekyll-sitemap to generate the sitemap
Don't publish these pages (WIP)
jekyll-mention creates a wrong links in textile pages where we use the syntax @this is code@
Fix erroneous **
Remove useless includes
Improve IDE docs
Reduce screenshot size
Improve 404
Use null layout
use info color
Add font awesome icons + reorganize others assets
Add RSS/Atom feeds links
Add twitter account link in navbar
Don't overwrite original JB includes. Use custom ones for an easier update
Merge remote-tracking branch 'upstream/master'

Conflicts:
	_config.yml
	atom.xml
Unify usage of tags (in posts and pages) and categories (posts only)
remove useless page