Execute a git command and return the result

Property definitions

nitc :: catalog $ Sys :: git_run
# Execute a git command and return the result
fun git_run(command: String...): String
do
	# print "git {command.join(" ")}"
	var p = new ProcessReader("git", command...)
	var res = p.read_all
	p.close
	p.wait
	return res
end
src/catalog/catalog.nit:650,1--659,3