v6.1:

- Fixed issue with high CPU load for NVIDIA cards.
- NVIDIA: now two builds are available: for CUDA 7.5 and for CUDA 6.5.
- Fixed issue with resetting WattMan settings.

NOTE: Still no Linux version yet, I need to have stable Windows version firstly.
NOTE2: I don't see good hashrates in cuda 6.5, at least in Win7. May be some specific drivers version must be used?