increased the driver strangth of portD to supply the flash
workaround for some bugs: issue #216 (first ADC read is always corrupt), some busywait/atomic bug
packaging: update nesc build.sh

This updates the build.sh script in the packaging/nesc folder to nesc
1.3.5 (which now comes from github).
Merge pull request #257 from lab11/packaging-updates

packaging: update nesc build.sh