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* add support for execution with the -m switch (issue 398), i.e. you
can execute conda also as: python -m conda
* add a deactivate script for windows
* conda build adds .pth-file when it encounters an egg (TODO)
* add ability to preserve egg directory when building using
build/preserve_egg_dir: True
* allow track_features in ~/.condarc
* Allow arbitrary source, issue 405
* fixed minor issues: 393, 402, 409, 413