Modify gitlearn to append to the coaching data file instead of re-creating each time

[tarmstrong]

Since running this command on large repositories takes a long time, it would be nice to just parse + process the commits that have happened since last time gitlearn was run.

[MattSeen]

I second this enhancement request. I am currently thinking of using gitcoach in my git hooks, but the time it takes to index my repo would deter me from using it.