add path_prefix specs.

Use actual authorize_url vs. config setting.
correct user_info_path (via leading slash)
dependencies: prepare for spec 3.0, include debugger
Update version to 0.0.3
Merge branch 'fix_user_api_path'

* fix_user_api_path:
  Update version to 0.0.3
  dependencies: prepare for spec 3.0, include debugger
  correct user_info_path (via leading slash)
  add path_prefix specs.
Add `rake spec`, make default