Fixed up build-msw.txt and yacoin-qt.pro to make building Windows
yacoind.exe and yacoin-qt.exe easier. Used Sarion's build instructions.
Changed to use Git for yacoin source. Added some instructions and
fixed some others.
Added md5sum checks. Added instructions to make test_yacoin.exe.
Also fixed the mingw makefile so it can make the tests.
Other helpful edits.
Need more DLLs to copy.
Merge pull request #23 from grokouser/fixQTbuild

Fixed up build instructions for Windows