Update README.md
Merge pull request #87 from leishman/master

Update README.md
Switch bitcoin-ruby back to lian now that it has the Litecoin fixes merged in.
Fix bin/hex response for 0conf txs: fixes #89
Merge pull request #90 from aalness/andy_fix_0conf

Fix bin/hex response for 0conf txs
Add preliminary support for Dogecoin.

Added Dogecoin network protocol version numbers and pre-Digibyte support for Dogecoin difficulty calculations.
Initial draft of calculations post-Digibyte are in place, but untested and commented out. Placeholder
inserted for AuxPoW handling.
Add Dogecoin difficulty hardforks

This adds the code to handle Digishield difficulty calculations for Dogecoin,
as well as correctly setting the switch-over block for when Dogecoin's testnet
difficulty calculations change to enable resets.
Corrected target time for Dogecoin post the Digishield switchover block.
Added initial draft of AuxPoW handling for Dogecoin. Note this does not yet work!