added command-line switch to enable proper scrypt targets
Fix exception on Ctrl-C
Updated contact email
Merge pull request #20 from Shmuma/master

Trivial fix for None method call on Ctrl-C
Merge pull request #13 from skralg/master

Command-line switch to enable proper scrypt target generation
--scrypt parameter renamed to --scrypt-target / -st
Fixed Popen
Added --log-file
Custom username and password for pool