mozilla-services/circus — pull request #751 by DYFeng (2014-03-21 02:14:02+00:00)
Title: Append virtualenv bin to $PATH.

We can using
```
[watcher:foo]
cmd=foo
virtualenv=virtualenv-path-of-foo
```
instead of
```
[watcher:foo]
cmd=virtualenv-path-prog/bin/foo
virtualenv=virtualenv-path-of-foo
```