fix breaking changes on headers in node.js 0.10
LINT
fix breaking changes on headers in node.js 0.10
fix breaking changes on headers in node.js 0.10
fix breaking changes on headers in node.js 0.10
maintain backward compatibility
fix breaking changes on headers in node.js 0.10
fix breaking changes on headers in node.js 0.10
fix import
ignore node_modules
bump version