- renmaed mbackup-for-windows.fsproj to mbackup.fsproj
  this file name is the project name. now exe is named mbackup.exe
- use framework dependent release.
- include rsync-mingw in one msi
- use installed rsync and ssh path in Program.fs

- introduced wix, make
- rsync-mingw64.msi works
- I decide to include rsync inside mbackup.msi, and install it in
  the same app dir. So this working rsync-mingw64.msi config will
  be removed in next commit.