- Changed to using integer values for seek()'s whence instead of os module constants. The module constants don't seem to be set on all version of Python.
- Changed to using integer values for seek()'s whence instead of os module constants. The module constants don't seem to be set on all version of Python.

altvec/tailhead,six8/pytailer,GreatFruitOmsk/tailhead,izaac/pytailer,GreatFruitOmsk/pytailer