samples: add Terra samples

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

samples/Terra/luabridgefn.t

@@ -0,0 +1,23 @@
+
+terra plus1(a : int)
+    return a + int(1)
+end
+
+terra afn() : int -> int
+    return plus1
+end
+
+terra doit(a : int, b : int -> int)
+    return b(a)
+end
+
+local test = require("test")
+
+local foobar = afn()
+test.eq(foobar(3),4)
+test.eq(doit(4,foobar),5)
+local function whatwhat(a)
+    print("I GOT A ", a)
+    return a + 3
+end
+test.eq(doit(5,whatwhat),8)