Sometime those macros are used under different namespaces. We need to use namespace ::paddle
to make it compile correctly.

Change-Id: I57a6d6ec8cd0d680b584aab62d72a35c226a24a4

* Different Type compare.
* ostream << should pass a const object.
* remove always true checks.

* Different Type compare.
* ostream << should pass a const object.
* remove always true checks.

* Check all files by pre commit hooks

* Fix glog check type unmatch in Util.cpp

#352 

* Fix sparse training for trainer_count=1

For trainer_count=1, the gradient machine is NeuralNetwork, which does not create parameter buf for PARAMETER_GRADIENT for sparse update in Parameter::enableType. But gradient parameter buf is still used in SgdThreadUpdater.

* Minor update to comment

* Fix bug in yield dictionary in DataProvider.
* Also make virtualenv work in Paddle.

* Use C++ 11 atomic_flag in MacOS as spin lock
* Add unittest for it.