Conda

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* add missing utf-8 decoding, fixes Python 3 bug when icondata to json file

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* move active script into conda-env, which is now a new dependency
* load the channel urls in the correct order when using concurrent.futures
* add optional 'icondata' key to json files in conda-meta directory, which
contain the base64 encoded png file or the icon
* remove a debug print statement

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* add --offline option to install, create, update and remove commands, and
also add ability to set "offline: True" in condarc file
* add conda uninstall as alias for conda remove
* add conda info --root
* add conda.pip module
* fix CONDARC pointing to non-existing file, closes issue 961
* make update -f work if the package is already up-to-date
* fix possible TypeError when printing an error message
* link packages in topologically sorted order (so that pre-link scripts can
assume that the dependencies are installed)
* add --copy flag to install
* prevent the progressbar from crashing conda when fetching in some
situations

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* conda install from a local conda package (or a tar fill which
contains conda packages), will now also install the dependencies
listed by the installed packages.
* add SOURCE_DIR environment variable in pre-link subprocess
* record all created environments in ~/.conda/environments.txt

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* only show the binstar install message once
* print the fetching repodata dot after the repodata is fetched
* write the install and remove specs to the history file
* add '-y' as an alias to '--yes'
* the `--file` option to conda config now defaults to
os.environ.get('CONDARC')
* some improvements to documentation (--help output)
* add user_rc_path and sys_rc_path to conda info --json
* cache the proxy username and password
* avoid warning about conda in pscheck
* make ~/.conda/envs the first user envs dir

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* improve error message for forgetting to use source with activate and
deactivate, see issue 601
* don't allow to remove the current environment, see issue 639
* don't fail if binstar_client can't be imported for other reasons,
see issue 925
* allow spaces to be contained in conda run
* only show the conda install binstar hint if binstar is not installed
* conda info package_spec now gives detailed info on packages. conda info
path has been removed, as it is duplicated by conda package -w path.