I can do that, but will it be funky that I have a `libexec/libexec` in the path?

Right now it looks like...

```
/usr/local/Cellar/xctool/0.1.7/build/bin/xctool
/usr/local/Cellar/xctool/0.1.7/build/lib/otest-shim-ios.dylib
/usr/local/Cellar/xctool/0.1.7/build/lib/otest-shim-osx.dylib
/usr/local/Cellar/xctool/0.1.7/build/lib/xcodebuild-fastsettings-shim.dylib
/usr/local/Cellar/xctool/0.1.7/build/lib/xcodebuild-shim.dylib
/usr/local/Cellar/xctool/0.1.7/build/libexec/mobile-installation-helper.app/Default-568h@2x.png
/usr/local/Cellar/xctool/0.1.7/build/libexec/mobile-installation-helper.app/Info.plist
/usr/local/Cellar/xctool/0.1.7/build/libexec/mobile-installation-helper.app/mobile-installation-helper
/usr/local/Cellar/xctool/0.1.7/build/libexec/mobile-installation-helper.app/PkgInfo
/usr/local/Cellar/xctool/0.1.7/build/libexec/otest-query-ios
/usr/local/Cellar/xctool/0.1.7/build/libexec/otest-query-osx
```

If I change the install root to libexec, I'll have...

```
/usr/local/Cellar/xctool/0.1.7/libexec/bin/xctool
/usr/local/Cellar/xctool/0.1.7/libexec/lib/otest-shim-ios.dylib
/usr/local/Cellar/xctool/0.1.7/libexec/lib/otest-shim-osx.dylib
/usr/local/Cellar/xctool/0.1.7/libexec/lib/xcodebuild-fastsettings-shim.dylib
/usr/local/Cellar/xctool/0.1.7/libexec/lib/xcodebuild-shim.dylib
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/mobile-installation-helper.app/Default-568h@2x.png
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/mobile-installation-helper.app/Info.plist
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/mobile-installation-helper.app/mobile-installation-helper
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/mobile-installation-helper.app/PkgInfo
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/otest-query-ios
/usr/local/Cellar/xctool/0.1.7/libexec/libexec/otest-query-osx
```

What do you think?