[BUG] Fix Bug in SmartStepGradientDescentOptimizer when looking for the
step
[TEST] Add a non-regression test for SmartStepGradientDescentOptimizer
[TEST] Comment unknown test programs in Tests/CMakeLists.txt
[TEST] Uncomment enable testing in main CMakeLists.txt
Merge branch 'experimental' of github.com:rousseau/fbrain into experimental