Making test suite timezone independent

Since I made a mess of my other branch (locally), this pull request is the fix for the problem described in #53 .

This pull request resolves the issue by making the tests timezone-compatible. There is no issue in normal usage, since all access there is programmatic, which is all done with UTC-based unix timestamps, for which all timezone conversion is done at the java end, upon printing, or by the OS (in case of displaying file updated times and such).