Changed the 'fpga/bitstreams' directory to contain board-ready binary files instead of the raw bitfile output of ISE.
This is supported by new versions of 'getbits' in each project folder.
Note that bootgen (which creates the binaries) does not do the right thing if the only file in the .bif is the bitfile,
to work around this I added dummy.elf files which are converted and then deleted.