examples/default: add README.md

Fixes #1068
Merge pull request #1071 from LudwigOrtmann/issue_1068

examples/default: add README.md
Merge pull request #1141 from LudwigOrtmann/msba2-term

make/msba2-common: allow TERMPROG override
tests/test_hwtimer_spin +wait: add success

Run 10k times and return success.
remove printfs
set timeouts, update messages (because of branch name conflict)
fix test/expect
use renes expect style