Feature/lambda alias

[frankfarrell]

** Its looks like the original project is not maintained anymore and https://plugins.jenkins.io/aws-lambda links to this project.

You can now specify an alias or version qualifer on invoking a lambda function. Implements XT-i#82

[yemkay]

Thanks for the feature. Not so explicit in docs, but you can specify the alias by suffixing the functionName with alias.
myFunction:aliasName