Fixed error occurred when theme doesn't include i18n files
Preview: Lower priority of public directory. Disable gzip compress.
Fixed multi line bug of backtick code block, simplified code
util.highlight: Replaced tab by default
Deleted useless code
Highlight not backtick code block
fixed bug of backtick code block
Added "path" and "permalink" properties to paginator class
Added "--debug" option
Changed hexo namespace to a EventEmitter object. Added "safe", "debug" properties to hexo namespace
Fixed rsync deployer #24
Added "Script" feature
Added some events
Added "gravatar" helper
Modified tag cloud helper
Added "render" helper
Added "filter" extension
Apply filter extension to ejs & swig
Paginator class: Added "base" property
Added "paginator" helper