2. Algorithm::load/save added (moved from StatModel)
3. copyrights updated; added copyright/licensing info for ffmpeg
4. some warnings from Xcode 6.x are fixed

Small error - object fs does not exist in this code example

Moved out of TLS to properly collect data from different threads;
Concurrent access guards were added to collection functions;

- note: uses VFPv3 instructions
- also added overloaded cvRound variants with float and int parameters
- thanks to Marina Kolpakova from Itseez for idea
- thanks to developers from #llvm IRC channel for help with inline asm

used BufferPool mechanism instead

they allow to perform asynchronous upload/download into temporary buffer
to get valid GpuMat object