Merge pull request #416 from gzm55/master

Compile CPU mining for win32 and win64
Remove scripts that make it too easy to compile CPU mining support.
Remove help option for cpumining in build environment.
Add extensive GPU FAQs for the flood of new Scrypt miners.
Update driver recommendations.
Add example 7970 tuning for scrypt in readme.
Minor README updates.
Update the total_tv_end only when we show the log to prevent failure to update logs.
Only update hashrate calculation with the log interval.