Update README.md

Provided an example for tags.
Update run_instance.rb

Print 'user_data' and 'tags' when run in debug mode
Update README.md

user_data examples
Update README.md

user_data examples
 include user_data output in launch info if set in Vagrantfile
 output a simple notification that user_data is configured in launch info
Merge remote-tracking branch 'upstream/master' into feature/userdata_launch_info
Merge pull request #58 from pidah/feature/userdata_launch_info

 include user_data output in launch info if set in Vagrantfile
Update CHNGELOG
Merge pull request #55 from patlachance/master

Tags and user_data examples
Remove tags from run instance for now
Update README with more examples
This should be env, not env2
Handle config.vm.box_url

Beause ConfigValidate checks options that may be provided by an AWS box,
we need to call BoxHandleUrl before ConfigValidate.
Merge pull request #64 from psi/handle-box-url

Handle config.vm.box_url