samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/string.t

@@ -0,0 +1,15 @@
+
+local c = terralib.includec("stdio.h")
+
+terra foo()
+    var a = "whatwhat\n"
+    return c.puts(a)
+end
+
+local test = require("test")
+local ffi = require("ffi")
+if ffi.os == "Windows" then
+	test.eq(foo(),0)
+else
+	test.eq(foo(),10)
+end