Switch 1.4.2 to seed.dogecoin.com

Switch 1.4.2 to seed.dogecoin.com so it can connect to 1.5 peers!
Update main.cpp
Update net.h
Update net.h
Update version.h
Update main.cpp
Merge pull request #276 from xnljfr/1.4.1

Switch 1.4.2 to seed.dogecoin.com