Conda

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* fix bug in new caching of repodata index

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* add caching of repodata index
* add activate command on Windows
* add conda package --which option, closes issue 163
* add ability to install file which contains multiple packages, issue 256
* move conda share functionality to conda package --share
* update documentation
* improve error messages when external dependencies are unavailable
* add implementation for issue 194: post-link or pre-unlink may append
to a special file ${PREFIX}/.messages.txt for messages, which is display
to the user's console after conda completes all actions
* add conda search --outdated option, which lists only installed packages
for which newer versions are available
* fixed numerous Py3k issues, in particular with the build command

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* add conda build --check option
* add conda clean --lock option
* fixed error in recipe causing conda traceback, issue 158
* fixes conda build error in Python 3, issue 238
* improve error message when test command fails, as well as issue 229
* disable Python (and other packages which are used by conda itself)
to be updated in root environment on Windows
* simplified locking, in particular locking should never crash conda
when files cannot be created due to permission problems

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* fixed conda update for no arguments, issue 237
* fix setting prefix before calling should_do_win_subprocess()
part of issue 235
* add basic subversion support when building
* add --output option to conda build

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* add Python 3 support (thanks almarklein)
* add Mercurial support when building from source (thanks delicb)
* allow Python (and other packages which are used by conda itself)
to be updated in root environment on Windows
* add conda config command
* add conda clean command
* removed the conda pip command
* improve locking to be finer grained
* made activate/deactivate work with zsh (thanks to mika-fischer)
* allow conda build to take tarballs containing a recipe as arguments
* add PKG_CONFIG_PATH to build environment variables
* fix entry point scripts pointing to wrong python when building Python 3
packages
* allow source/sha1 in meta.yaml, issue 196
* more informative message when there are unsatisfiable package
specifications
* ability to set the proxy urls in condarc
* conda build asks to upload to binstar. This can also be configured by
changing binstar_upload in condarc.
* basic tab completion if the argcomplete package is installed and eval
"$(register-python-argcomplete conda)" is added to the bash profile.

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* fixed conda update when packages include a post-link step which was
caused by subprocess being lazily imported, fixed by 0d0b860
* improve error message when 'chrpath' or 'patch' is not installed and
needed by build framework
* fixed sharing/cloning being broken (issue 179)
* add the string LOCKERROR to the conda lock error message