Funcy

- added is_tuple()
- raiser() can now be called without arguments, defaults to Exception
- support del cached_property
- optimized and cleaned up cached_property
- optimized i?split(), split_at() and split_by()
- optimized memoize
- optimized zipdict()
Backward incompatible changes:
- split(), split_at() and split_by() now return a tuple of two lists instead of list of them
- cached_property no longer uses _name to store cached value
- partial() is now an alias to functools.partial, use func_partial() for old behaviour

- added experimental python 3 support
- added python 2.6 support
- added autocurry()
- published idistinct(), isplit(), isplit_at(), isplit_by()
- some optimizations

- added raiser()
- added idistinct()
- added key argument to i?distinct()
- added key argument to is_distinct()
- added group_by_keys()
Backward incompatible changes:
- walk_values() now updates defaultdict item factory to composition of mapper and old one
- izip_dicts() now packs values in tuple separate from key
- decorator raises AttributeError not NameError when non-existent argument is accessed by name

- added i?flatten()
- added pairwise()
- added nth()
- added is_seqcont()
- greatly optimized decorator
- added log_durations and print_durations
- logs_calls and print_calls now provide call signature on return
- logs_calls and print_calls now log errors, optional for log_calls
- better call signature stringification for (log|print)_(calls|errors)
- fixed i?partition() and i?chunks() with xrange()
Backward incompatible changes:
- is_iter() now returns False given xrange() object

- added izip_values() and izip_dicts()
- added last() and butlast()
- added isnone() and notnone() primitives
- added extended fn semantics to group_by(), count_by() and i?partition_by()
- added fill argument to with_prev()
- optimized ilen()

- fixed installation issue