Allow configuration of git author, email and check interval

[Joibel]

This is a simple change to allow configuration of a few hardcoded git options that I'd like to be able to configure.

10 second pushing is too frequent for my use. I'm pushing to gerrit, which expects each user to register their author details, so I'd like to be able to change those.

[coveralls]

Coverage increased (+0.2%) to 86.552% when pulling 542a0e7 on Joibel:feature/gitconfigopts into d0a1ad8 on bpineau:master.

[bpineau]

All LGTM,
I assume the configurable interval is meant to batch more to reduce noise on high churn surges, is that the case?

Wondering if "commit+push soon if possible, not more than once per user-defined-interval" could be a finer option (as in: archive quickly, with commit timestamps close to the change's timestamp when possible, but batch if needed)? Wdyt?

[Joibel]

I'll rebase this, and split the username stuff out and have a look at your idea. It does make sense. It is about reducing noise, and I actually some more filters for that. I'll see what I can do about that patch too and see what it looks like after that.

[sadortun]

Hi @Joibel, did you made progress on this PR ?

Will this allow us to reduce the numbers of commits/push to something like one per hour/day maximum ?