various update

improved m7
fixed --help in cpuminer.c (thanks to tpruvot)
added average and standard deviation (statistics error on average)
hashrate
change in the method to search for findind nonce in keccak256
correct compatibility issues
cudaDeviceReset on Ctrl+C for nvprof

windows and linux commits

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
update gitignore and add build.sh

remove some generated files present in .gitignore

That will delete them on pull but will be ignored on recreate
output: add the --color parameter (-C)

disabled by default or if syslog option is set

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
windows: implements the color option

based on old git implementation (2009)

Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
update configure for mpir lib