use out parameter for vtimer_now
add missing &
Remove undefined variables from Makefiles

The following variables are included in various Makefiles but never
defined.

    $(BOARDINCLUDE)
    $(PROJECTINCLUDE)
    $(CPUINCLUDE)
Merge pull request #53 from mehlis/include

Remove undefined variables from Makefiles
Merge pull request #51 from mehlis/vtimer

use out parameter for vtimer_now
Merge pull request #50 from mehlis/master

remove recursive include