Merge branch 'hotfix/1.1.5'
Fixed callback not called in file.dir when source directory not exist
Added include_code tag plugin
Merge pull request #189 from chaizhenhua/master

Added include_code tag plugin
Merge branch 'master' of https://github.com/tommy351/hexo
Merge branch 'dev'
Fixed include_code tag plugin
Removed `highlight.backtick_code_block` option
Removed useless code
specify version of dependencies
Merge branch 'master' into dev