facebook/buck — pull request #177 by bayandin (2014-08-15 09:55:28+00:00)
Title: Fix exit code for usage with --help

When I use buck with option `--help` it exits with non-zero code.

```
bayandin@mbp:~/repos/buck$ bin/buck --version
Not using buckd because watchman isn't installed.
buck version e2f2eec283d05ea117c983030a9f0b359127bb27

bayandin@mbp:~/repos/buck$ bin/buck --help
Not using buckd because watchman isn't installed.
buck build tool
usage:
buck [options]
buck command --help
buck command [command-options]
available commands:
audit lists the inputs for the specified target
build builds the specified target
cache makes calls to the artifact cache
clean deletes any generated files
install builds and installs an APK
project generates project configuration files for an IDE
quickstart generates a default project directory
run runs a target as a command
targets prints the list of buildable targets
test builds and runs the tests for the specified target
uninstall uninstalls an APK
options:
--help : Shows this screen and exits.
--version (-V) : Show version number.

bayandin@mbp:~/repos/buck$ echo $?
1
```

This PR fixes this unexpected behaviour.