[exif2timestream] support giving "now" as a date

This allow one to set end date to be "now", and then you don't have to
change the date in the config file until the expt acutally ends.
[setup.py] bump version to 0.2.7
[config_dates] add a "now" end date config to test
Merge pull request #16 from kdmurray91/dev

Enable "now" as a date constant
[exif2timestream] redo loging w/o global log inst

Don't have a global instance of the logger object.
Also, add a couple of warnings.
[setup.py] bump version
[exif2timestream] update logging & bugfixes
[setup.py] bump verison 0.2.9
[e2t] bugfix syntax error!
[e2t] minor bug fix
[exif2timestream] implement cam numbers
[run_from_cmdline] show resulting files
[exif2timestream] fix generation of csv
[exif2timestream] fix handling of mixed case

Now, subdirs and extensions can be any case. This means we can use this
on linux, as it ACTUALLY FUCKING KNOWS THE DIFFERENCE BETWEEN TWO
NUMBERS. THE FUCK, Windows.
[test/unburnable] add _dir in camupload

The timestreamiser should never look in subdirs of the source dir
starting with _. This add a valid image under a subdir starting w/ _, to
attempt to confuse find_image_files.
[run_tests] exclude exifread logging from capture
[find_image_files] misc fixes to subfolder handling
[exif2timestream] print progress every image
[setup.py] bump version to 0.2.12
Add versioneer as the versioning manager