s3 deployment packages

Like the terraform aws_lambda_function this module now all supports specifying the deployment package either directly as a local file (using the filename argument) or indirectly via Amazon S3 (using the s3_bucket, s3_key and s3_object_version arguments). If filename is specified, the s3_-prefixed options cannot be used. (see docs).

With this release the source_code_hash isn't computed automatically anymore. If you like to trigger updates of your lambda function, please set this variable in the module configuration (see docs for details).