Added an update task to update the submodule.
Updated ruby-advisory-db
Renamed Advisory#cve to Advisory#id.

* Alias #to_s to #id.
Updated Advisory specs to use the new OSVDB advisory files.
Ensure the secure bundle is updated to the latest version of rails.
Fixed Scanner specs.
Updated the integration specs given the new ruby-advisory-db.
Version bump to 0.2.0.
Updated the ChangeLog for 0.2.0.
Updated the example output.
Updated Features.
Changed the project URLs.
Merge remote-tracking branch 'upstream/master'
Whitespace cleanup.
Make specs more resilient to tweaks in their `Gemfile`s.

Less manual intervention should be needed when changing the `Gemfile` of a spec.
Bump version, update changelog.