Change `activate` behavior on multiple versions

Refactor init code

dd a script to hook `source activate` for Anaconda/Miniconda

Support uninstall and rehash of virtual environments created in `envs`

Create virtualenv inside `envs` directory as similar as Anaconda

Rewrite `activate` without using virtualenv/venv/conda's script

init: zsh: prepend hook to precmd_functions

This makes sure that $VIRTUAL_ENV is handled already in other precmd
functions, especially your ...

Passing return value from executed command.

find proper source version from pyenv if the given executable is only
basename or is a shim script.

pyenv-virtualenv-init fix for fish

update init step in brew installation instructions

This fixes issue: https://github.com/yyuu/pyenv-virtualenv/issues/36

Apply code blocks style

https://www.python.org/dev/peps/pep-0370/

Manage Anaconda/Miniconda environment as a pyenv version

an executable is not found in it, automatically look up the executable
for source Python version....

init: fix shell detection when invoked from a script

- fixes `ps` command to lookup parent process
- adds `assert_output_contains_not` test helper
...

It will be done by `get-pip.py` and we don't have to do anything explicitly.

First release after my son's birth....

activate: do not display note if initialized already

Use `typeset -g` with `precmd_functions`

This fixes displaying the note, in case "init" has been run manually
and/or the init is not in t...

Usage: version is optional

minor: fix comments

Link to English venv documentation

Currently the link to venv points to the Japanese version of the Python documentation.
Change t...

Ignore failure of pyenv activate

When the current pyenv environment is not a virtualenv, this line
exits with a return code of 1....

This makes it possible to use `eval "$(pyenv virtualenv-init -)"` from a
function.

fix wrong output in test in fish, refs 240a1de

"(any command)" is not supported in test in fish, we have to set a
variable and then use that

fix warns for virtualenv-init corner case on fish

The situation is when in a directory containing python binary,
`pyenv prefix' will return empty ...

Some doc fixes: typos, grammar, clarification and formatting