Conda

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* use numpy 1.7 as default on all platfroms

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* fixed bug in conda.builder.share.clone_bundle()

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* feature selection fix for update
* Windows: don't allow linking or unlinking python from the root
environment because the file lock, see issue 42

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* fix some feature selection bugs
* never exit in activate and deactivate
* improve help and error messages

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* fixed conda pip NAME==VERSION
* added conda info --license option
* add source activate and deactivate commands
* rename the old activate and deactivate to link and unlink
* add ability for environments to track "features"
* add ability to distinguish conda build packages from Anaconda
packages by adding a "file_hash" meta-data field in info/index.json
* add conda.builder.share module

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* fixed detecting untracked files on Windows
* removed backwards compatibility to conda 1.0 version