Lambda JS files should move to a subdirectory

Current situation:
Javascript files for Lambda functions (and probably any lambda source file) are in the root of the generated zip file. Calling `aws cloudformation package` causes each Lambda to include all files in the root directory, including `.git` and `.idea` directories. Uploads take longer than necessary and contain data that shouldn't be in there.

Feature request:
Move each Lambda file to its own directory and reference that in the Cloud Formation template when generating a zip file for download.