Set configuration and building of IBAMR to off by default.

IBAMR wont compile on windows at the moment.  If you are not in
a windows environtment and want to test the FSS app then set the option
MSVTK_APP_FFS to ON on the cmake gui.

Closes #28
Fix button clustering test.

The button clusetering test is missing the msv prefix.
Closes #29
Merge branch '28-not-compile-ffs-in-windows' into master_new

* 28-not-compile-ffs-in-windows:
  Set configuration and building of IBAMR to off by default.
Merge branch '29-fix-buttonCluster-tests' into master_new

* 29-fix-buttonCluster-tests:
  Fix button clustering test.