fix issue http://code.google.com/p/python-progressbar/issues/detail?id=14
Try evaluating builtin names instead of checking against __builtins__ or the __builtin__ module
Consistently use triple double quotes for docstrings. Also some other style fixes.
Moved progressbar class to its own file, leaving __init__.py empty with no significant code.
Remove format as a slot attribute, as that is not compatible with python 3.3
Added AdaptiveETA widget contributed by Oscar Benjamin
make it work on empty iterables: http://code.google.com/p/python-progressbar/issues/detail?id=24
add gitignore