Add pypy3 5.10.1

Do not create `clear` shim when Anaconda is installed

Add `clear` to the Anaconda's default blacklist in order to prevent
pyenv from creating the shim script for it.

The `clear` command executable began included from Anaconda 5.0.0
onwards, and this executable now conceals that of the user's base system
- this hinders the user from running the `clear` command with the
`command not found` error output if a user installs and selects one or
more Python version(s) other than Anaconda 5.x.x.

Adding this one-liner to the blacklist allows the user to use the
`clear` command even when Anaconda 5.x.x is not selected by pyenv.

Allow binary installs of PyPy on Xenial

Add PyPy[23] 5.10

closes #1061

Add CPython 3.6.4 and remove 3.6.4rc1

Fix pyenv install on Solaris / Illumos

pyenv install crashes on Solaris with an empty log file. Adding support for the proper Solaris getconf call in num_cpu_cores fixed it. Tested and working under OmniOS CE r151024.

* Added final Python 3.3 release, 3.3.7
* Removed Python 3.3.7rc1

Better error message for `rbenv shell`

Shell integration is not enabled by default. This means that, from all the
commands from `rbenv commands`, only "shell" won't work right away.

Replace "no such command" with a more descriptive message that points to
`rbenv init` instead.

Check wget version iff wget is going to be used

Fix some issues reported by shellcheck

Fix fish subcommand completion

Fixed `rbenv init -` output to work w/ no args and bash's `set -u`.

partly resolve #759

test/which.bats: do not export PATH

rbenv-version-file: ensure that the version file is a file

Fixed support for commas for all environment variables in configure script

Do not check when tarball is cached

Fix $PWD changes when executing Python

Otherwise `sed` might not be found later in bats/libexec/bats-exec-test,
in case `/usr/bin` gets removed.

Create releases on GitHub automatically from tags (fixes #1038)

Specifically, this does not play well with PWD=/proc/self/cwd

Add micropython 1.9.3

Get number of processors using getconf over cpuinfo grep