providers/aws: db instances now depend on db security groups
providers/aws: remove password from resource diff to not trigger changes

cc/ @mitchellh

This one caught me a bit, and I'm not sure if there's another AttrType
that could be useful here – perhaps a AttrTypeHidden or something? I
don't know...this feels sloppy to have in the diff func.
providers/cloudflare: add bins

close #126
Fix example digital ocean image name
Allow specifying the AWS availability zone on creation
Merge pull request #128 from nrempel/patch-1

Fix example digital ocean image name
providers/aws: db instance wait for destroy, allow destroy config
makefile: increase acceptance test timeout
update changelog
Merge pull request #129 from dcosson/aws_availability_zone

Allow specifying the AWS availability zone on creation
update changelog
providers/aws: add tests for instance availability zone

cc/ @dcosson here we go!
Fix a minor typo in the README.
Merge pull request #132 from jlund/typo

Fix a minor typo in the README.
providers/digitalocean: restart droplet in failed resize
providers/digitalocean: only save private ip address if private
providers/digitalocean: fix comment
Add documentation for aws_db_instance/final_snapshot_identifer.
Merge pull request #137 from hectcastro/final_snapshot_identifier

Add documentation for aws_db_instance/final_snapshot_identifer
Fix output of aws_db_instance port via endpoint

When trying to output the `endpoint` attribute of an `aws_db_instance`,
the port was not being emitted properly. Converting the port number from
an integer to a string has resolved the issue.