Not able link build/src/top/tensor/*.d.
       Hence don't compile nnvm for a change in tvm/topi headers.

* Updated TVM version. Implemented fix for nnvm_compiler crash on exit on windows. Changed TOPI ops from using python to using C++ where applicable.

* Fix lint

* Fix lint

* Fix macro

* Fix reshape

* Update TVM to fix test fails

At present, the build system assumes that the Unix archiv utility 'ar'
will always be present in PATH, but this might not be true if a separate
toolchain is being used. This patch makes the build system a bit more
cross-compile capable.

* [PASS] PrecomputePrune, add testcase

* update comment

* [LIBINFO] Enable load .dylib on darwin

* Fix makefile

* CMake/make adjustments and warning fix

* Fix warnings

* Remove dmlc headers, add optional DMLC_CORE_PATH variable for build path

* travis.yml doesn't need to clone dmlc-core anymore

* chomo

* try mac options

* trigger travis

* fix

* chomo

* make

* squash