Merge branch 'hotfix/0.0.8'

* hotfix/0.0.8:
  bump version to 0.0.8
  build js
  allow url to be overridden by href attribute
  don't provide URLs
update comment
check against an empty string, too
allow a custom url to be set on each directive
build
update demo
bump version to 0.0.9
Merge branch 'hotfix/0.0.9' into develop

* hotfix/0.0.9:
  bump version to 0.0.9
  update demo
  build
  allow a custom url to be set on each directive
  check against an empty string, too
  update comment