Anaconda-cli

* fix reading of conda root prefix on a detached environment in Python 3

Fixed
* `anaconda config` should expand paths before reading them

Fixed
* `anaconda config --set` should use `BINSTAR_CONFIG_DIR`
* Save `<host>.token` to the old directory, so `conda` can read them

Added

* `anaconda upload` will extract icons from conda packages
* Added explicit license file
* Added some clarity on help file for -u switch (PR360)

Fixed
* Removed workaround for old requests versions
* `anaconda upload` would raise an exception if a file was interactively
not overwritten (364)

Changed
* `anaconda-client` will load configuration files with the extension `.yaml` from
the directories `~/.continuum/anaconda-client`, `/etc/anaconda-client` and `$PREFIX/etc/anaconda-client`.

Added
* `anaconda upload` learned to include whether `info/has_prefix`
exists in a conda package as metadata (as true/false).
* `anaconda upload` can upload projects with a kapsel.yml (for
conda kapsel)

Fixed
* `anaconda groups` subcommand had several bugs, and was difficult to use (312)
* `anaconda upload` will do the minimal amount of work to parse a conda package (brentp) (311)
* `anaconda upload` had Unicode errors when dealing with Jupyter notebooks (306)

* `BinstarClient.user_packages` learned arguments `platform`, `package_type`,
`type_`, and `access`