Merge pull request #29 from srmo/master

New Button icons/remove buttontext for Next/Back - Mission: try to prettify the installer
[installer] [host] update manifest so mt parses it correctly. use static
path for mt.exe call as this causes issues otherwise. don't mount in
mingw32; just use c/ full PATH.
[installer] [host] remove old logo.png
[installer] [host] add a prompt for the NFS path when NFS install is
selected; store in MainWindow. add getNFSPath() for preseeding
[installer] [host] do not include old "logo.png" in assets
[installer] [host] windows: fix Qt PATH on Windows
Revert "[installer] [host] remove old logo.png"

This reverts commit b97cd7cd587b17a94d3618ad1d2b18c456be1d23.
Revert "[installer] [host] do not include old "logo.png" in assets"

This reverts commit 2dde563ab47bbf2824d7c6f8649eb0c1ca106ee4.
[installer] [host] Add preseeder which creates a Debian-like preseed.cfg file. We then mount the first filesystem and write it to device. Windows not yet implemented. This needs testing.
[installer] [host] /bin/sync post umount to ensure data integrity