Update setuptools/pypi version to 1.6 (sorry)

Release 1.5.1.

Add 1.4.3 tag.

Add 1.4.2 tag.

Add 1.4.1 tag.

Add new branch and tag for 1.4.

Add tag for 1.3.81 (1.4 beta1)

Add 1.3.3 tag.

updated by merging with branch 2.0

Use environ for gw test config (for now).

Use python -B (2.6 only) to avoid generating .pyc on gateways (http://docs.python.org/using/cmdline.html#miscellaneous-options).