sgminer with support for the new vertcoin algo (lyra2REv2)

5.1.3-lyra2rev2

modified default difficulty for lyra2re original; algo aliases

sgminer with support for the new vertcoin algo (lyra2REv2)

5.1.2-lyra2rev2

correct typo

sgminer with support for the new vertcoin algo (lyra2REv2)

5.1.1-lyra2rev2

bug fix on original lyra