Improve scripts

[ttarczynski]

• find were we have code duplication in the bash scripts and generalize where appropriate
  • generic bin/run_*.sh and bin/destroy.sh scripts – Universal bin/apply* bin/destroy* scripts #53
  • generic bin/run_*_examples.sh scripts #182
  • generic bin/get_*_examples.sh scripts
  • generic bin/shared_*_examples.sh scripts
• use symlinks instead of 2-line scripts (if possible): destroy.sh, run.sh
• add cleanup.sh script to: destroy and remove all files created by terraform #181