spartan3 ise stuff
Merge branch 'master' of git://github.com/milkymist/mibuild
Merge branch 'master' of git://github.com/milkymist/mibuild
* generic_platform.py: add a finalize() method

... to add e.g. timing constraints after the other modules have
had their say and when the signal names are known
add Avnet Spartan6 LX9 micrboard platform