README for perl scripts

Documentation and help output

For each script, there should be documentation written in pod and help output.

Docs are read with perldoc. For example:

perldoc get_unique_updates/get_unique_updates.pl

Each script should have help output. For example:

get_unique_updates.pl --help

Tests are run with prove. To run all tests for a script, run prove on all the test files in the test directory:

prove get_unique_updates/t/*.t