Create timestamps using git log

With the option date=local, we get git to give back the local time
(corrected for the time zone offset, which git already knows). The
advantage here is that times are localized, instead of all being UTC.
Pass timestamp value to composeSnapshot()

Fix a bug introduced where we failed to SPLIT the log lines after we
get the from the git log
Merge pull request #48 from briandk/fix-timestamp-offset

Make displayed timestamps the local time in which commits were authored