fix 1342 updates to sample.env

- Updated the default PUBLISH_HOST_PREFIX to work locally without s3.
- Added default makeapi values to work locally with default makepi values.
- Changed the port because makeapi uses 5000. I set it to 5001 but I don't have an opinion on the port we should use here. This is going to be changed in the sample config, so it shouldn't break anyones work flow until they copy the env sample over next, so we should probably send out a small email at the least that we want to change the default appmaker port.
- Also updated gitignore because it was driving me nuts :P