Use Symfony ExecutableFinder for locating vagrant binary

[c33s]

in your Base.php file, you use a hardcoded path, which is also linux specific. on windows your task would fail, except i provide the path to the executable.

i would reccomend using the symfony ExecutableFinder of the symfony/process component, which avoids hardcoded path and also is cross platform compatible.

an example usage is the PhpExecutableFinder which is performance optimized. the real ExecutableFinder is called at Line 70

[joestewart]

Thanks!

It appears that Robo 1.x will have this supported with a findExecutable method using ExecutableFinder.

https://github.com/consolidation-org/Robo/blob/master/src/Common/ExecCommand.php

Added a PR on #3 for some additional testing.

On linux and OS X I think it could pretty much be assumed that vagrant is in the PATH though and just call "vagrant"