yyuu/pyenv — pull request #101 by honishi (2014-01-09 05:50:46+00:00)
Title: Fix grep matcher option conflict in 'pyenv install -l' command.

I have set `GREP_OPTIONS="-E"` in my `~/.bashrc` as I normally want grep to work regular expression enabled.
But in this case, `pyenv install -l` command does not work as followings:

````
$ pyenv install -l
Available versions:
grep: conflicting matchers specified
$
````

This is because grep option -F(Fixed strings matcher) is used in the script and this matcher option conflicts with the other option like -E(Extended regexp matcher), -G(Basic regexp matcher), -P(Perl regexp matcher).

So I prefixed `env --unset=GREP_OPTIONS` to the `grep` in the script, and this worked for me.

````
$ pyenv install -l
Available versions:
2.4
2.4.1
2.4.2
...
````

It is much appreciated if you would take a look at this pull request.

Thanks.