predict method rewritten to use with PredictCollector interface (abstract class)
now face recognizer allow to perform different scenarios of result handling

results in less code and more consistent parameter handling.

It doesn't support thread_local

Fixed warnings for XCode 7.1.1 and cmake 3.3.2, rewrote one method in sliency to avoid clang 7.0.0 crash

According to ISO C++03 14.2/4 it should use the template keyword to fix this => http://stackoverflow.com/a/3786481/724098

cvx::checkHardwareSupport uses static field to store flags.
Using a global static to store the result is dangerous, as the underlying field checkHardwareSupport uses might not be initialized at that time.