Conda

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* conda build: move broken packages to conda-bld/broken
* conda config: automatically add the 'defaults' channel
* conda build: improve error handling for invalid recipe directory
* add ability to set build string, issue 425
* fix LD_RUN_PATH not being set on Linux under Python 3,
see issue 427, thanks peter1000

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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

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* add "foreign mode", i.e. disallow install of certain packages when
using a "foreign" Python, such as the system Python
* remove activate/deactivate from source tarball created by sdist.sh,
in order to not overwrite activate script from virtualenvwrapper

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* remove ARCH environment variable for being able to change architecture
* add PKG_NAME, PKG_VERSION to environment when running build.sh,
.<name>-post-link.sh and .<name>-pre-unlink.sh

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* minor fixes related to make conda pip installable
* generated conda meta-data missing 'files' key, fixed issue 357

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* add conda init command, to allow installing conda via pip
* fix prefix being replaced by placeholder after conda build on Unix
* add 'use_pip' to condarc configuration file
* fixed activate on Windows to set CONDA_DEFAULT_ENV
* allow setting "always_yes: True" in condarc file, which implies always
using the --yes option whenever asked to proceed