describe_tags
Merge branch 'master' into describe_tags
export erlcloud_ec2:describe_spot_instance_requests/2
fix crash on erlcloud_ec2:describe_instance_attribute if attribute is empty
Merge pull request #21 from fogfish/master

fix crash on erlcloud_ec2:describe_instance_attribute
Update describe_tags to return {ok, _} or {error, Reason}
Add EDoc comments
update readme with example and reformat it as Markdown
Merge pull request #19 from talko/describe_tags

Add DescribeTags command
untabify all files
reindent all files with default emacs' erlang-mode indent rules:
- no tabs
- indent level = 4