Compile front-end (#476)

* fix tests for linux

* make a move on compile

* basic compile scaffold works

* compile binding

* clean

* fix

* fix grad, more tests

* basic python tests

* fix segfault on python exit

* compile works with python closures

* fix test

* fix python globals bug, and erase

* simplify

* more cpp tests

* bug fix with move function and compile at exit

* simplify inputs also

* enable and disable compiler

* remove simplify

* simplify tests use compile now

* fix multi-output with compile

* clear output tree from cache when function goes out of scope

* ../python/src/transforms.cpp

* remove closure capture

* comments

tests/ops_tests.cpp

@@ -511,6 +511,7 @@ TEST_CASE("test is inf") {
   CHECK_FALSE(isinf(x).item<bool>());
 
   auto inf = std::numeric_limits<float>::infinity();
+
   array y(inf);
   CHECK(isinf(y).item<bool>());