Merge pull request #2 from sexcoin-project/master

sexcoin-project updates
Fix KGW algorithm to prevent KGW Timewarp attack

Anti Timewarp attack code causes hard fork, set to activate at block 643808
version bump to 0.6.4.6
Merge branch 'master' of https://github.com/sxcer/sexcoin
fix version numbers that were somehow hosed up
Merge pull request #11 from sxcer/master

Fix KGW Timewarp vulnerability