Release step

• modify fibjs/include/version.h, change version string.
• run tools/changelog.js, generate changelog.
• update&translate docs.
• commit fibjs with "Release v#.##"
• merge dev into master
• tag fibjs with "v#.##"
• switch branch of fibjs to dev.
• modify fibjs/include/version.h, change version string to "dev".
• commit fibjs with "dev v#.##"