Command for efficient packaging of kalite

This is necessary for updating the installation process.

This command contains logic for including/excluding files in kalite install, based on:
* locale (includes all if not specified, otherwise one only)
* platform (includes all scripts if not specified, otherwise only useful ones)
* server_type (only include central server app and resources if on the central server; default is non-central (keyword doesn't matter))

This command creates an appropriate local_settings file with:
* requested server_type
* requested locale (if specified)

Excludes things like:
* .gitignore
* tests, testing, loadtesting, etc