Travis rebuilding the code 3 times

[kj800x]

Ideally, we don't have travis build the app again when it goes to do the deployment stages, but as of now, there isn't a good way to reuse the artifacts from earlier stages in later stages in travis. If we can use the code from the compile-site stage in the deploy to s3 and the upload to webstore stages, we could cut down on build times a ton!