Conda

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* allow prefix replacement in binary files, see issue 710
* check if creating hard link is possible and otherwise copy,
during install
* allow circular dependencies

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* conda clean --lock: skip directories that don't exist, fixes 648
* fixed empty history file causing crash, issue 644
* remove timezone information from history file, fixes issue 651
* fix PackagesNotFound error for missing recursive dependencies
* change the default for adding cache from the local package cache -
known is now the default and the option to use index metadata from the
local package cache is --unknown
* add --alt-hint as a method to get an alternate form of a hint for
unsatisfiable packages
* add conda package --ls-files to list files in a package
* add ability to pin specs in an environment. To pin a spec, add a file
called pinned to the environment's conda-meta directory with the specs to
pin. Pinned specs are always kept installed, unless the --no-pin flag is
used.
* fix keyboard interrupting of external commands. Now keyboard interupting
conda build correctly removes the lock file
* add no_link ability to conda, see issue 678

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* always use a pkgs cache directory associated with an envs directory, even
when using -p option with an arbitrary a prefix which is not inside an
envs dir
* add setting of PYTHONHOME to conda info --system
* skip packages with bad metadata

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* added revision history to each environment:
- conda list --revisions
- conda install --revision
- log is stored in conda-meta/history
* allow parsing pip-style requirement files with --file option and in command
line arguments, e.g. conda install 'numpy>=1.7', issue 624
* fix error message for --file option when file does not exist
* allow DEFAULTS in CONDA_ENVS_PATH, which expands to the defaults settings,
including the condarc file
* don't install a package with a feature (like mkl) unless it is
specifically requested (i.e., that feature is already enabled in that
environment)
* add ability to show channel URLs when displaying what is going to be
downloaded by setting "show_channel_urls: True" in condarc
* fix the --quiet option
* skip packages that have dependencies that can't be found

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* fix the --file option
* check install arguments before fetching metadata
* fix a printing glitch with the progress bars
* give a better error message for conda clean with no arguments
* don't include unknown packages when searching another platform

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* Fix setting of PS1 in activate.
* Add conda update --all.
* Allow setting CONDARC=' ' to use no condarc.
* Add conda clean --packages.
* Don't include bin/conda, bin/activate, or bin/deactivate in conda
package.