Conda

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* make use of Crypto.Signature.PKCS1_PSS module, see 1388
* note when features are being used in the unsatisfiable hint

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* add ability to verify signed packages, see 1343 (and conda-build 430)
* fix issue when trying to add 'pip' dependency to old python packages
* provide option "conda info --unsafe-channels" for getting unobscured
channel list, 1374

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* avoid the Windows file lock by moving files to a trash directory, 1133
* handle env dirs not existing in the Environments completer
* rename binstar.org -> anaconda.org, see 1348
* speed up 'source activate' by ~40%

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* correctly allow conda to update itself
* print which file leads to the "unable to remove file" error on Windows
* add support for the no_proxy environment variable, 1171
* add a much faster hint generation for unsatisfiable packages, which is now
always enabled (previously it would not run if there were more than ten
specs). The new hint only gives one set of conflicting packages, rather
than all sets, so multiple passes may be necessary to fix such issues
* conda extensions that import conda should use
conda.cli.conda_argparser.ArgumentParser instead of
argparse.ArgumentParser to conform to the conda help guidelines (e.g., all
help messages should be capitalized with periods, and the options should
be preceded by "Options:" for the sake of help2man).
* add confirmation dialog to conda remove. Fixes conda remove --dry-run.

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* fix issue where forced update on Windows could cause a package to break
* remove detection of running processes that might conflict
* deprecate --force-pscheck (now a no-op argument)
* make conda search --outdated --names-only work, fixes 1252
* handle the history file not having read or write permissions better
* make multiple package resolutions warning easier to read
* add --full-name to conda list
* improvements to command help

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* fix logic in memoized for unhashable args
* restored json cache of repodata, see 1249
* hide binstar tokens in conda info --json
* handle CIO_TEST='2 '
* always find the solution with minimal number of packages, even if there
are many solutions
* allow comments at the end of the line in requirement files
* don't update the progressbar until after the item is finished running
* add conda/<version> to HTTP header User-Agent string