- Added DeadLetterConfig parameter

[motdotla#206](motdotla#206)

- Fix default value of EVENT_SOURCE_FILE set ''
[motdotla#205](motdotla#205)
- Removed event_sources.json
[motdotla#204](motdotla#204)
- Add -S, --eventSourceFile option.
[motdotla#203](motdotla#203)

- Event source mapping support [motdotla#189](motdotla#189)

- Fix version of Node.js supported by AWS Lambda [motdotla#197](motdotla#197)
- How about it if you have the option to specify the zip file? [motdotla#199](motdotla#199)
- Add 'Runtime' to the params of lambda.updateFunctionConfiguration [motdotla#200](motdotla#200)

- Fix unit test failure at travis [motdotla#198](motdotla#198)