Pyerector

-- Add IteratorTask and MapperTask classes to help.
-- Move Target, Task, Iterator and Mapper out of pyerector.base.
-- Add wdir argument to Spawn.
-- Add target to push to pypi.
-- Move noop and noTimer to variables, pyerector.noop and pyerector.notimer respectively.
-- Yield tuple subclass instance, MapperPair, from Mapper iterator.
-- rootdir member of pyerector.vcs.base.Base will search tree for checkout db directory.

-- Fix regression/pyerect and SubPyErector.

-- Integrate to using Path (most) everywhere.
-- Add Arguments class to handle arguments to Tasks.
-- Move tasks to plugin format under pyerector/tasks/.
-- Make Version instance displayable.
-- Update pypi homepage value to bitbucket
-- Add EncodeVar task
-- Add a filename property to FileVariable and change how value property is handled.
-- Changes based on coverage and pylint.

-- Make Version instance displayable.
-- Update Copyright dates.

Other fixes/enhancements
-- Py3k cannot sort types, so key off the names.
-- Must preserve the logging level number as you cannot retrieve the
level from the name in Py3k.
-- Update download url after google code removed uploads.
-- Add "homedir" as a standard Variable.
-- Add new targets "install" and "force".
-- Update Copyright dates.

-- Issue 34 - Remove Unittest from the tasks of Testonly
Other fixes/enhancements:
-- Exclusions handle usedefaults better; usedefaults=False, add vcs
names; usedefaults=None, nothing added.
-- Fix vcs.base.Base.vcs_check to search each directory for a vcs
before moving up, to prevent nfs mount issues.
-- Fix warnings where EGG-INFO files were added twice to the toadd
list.