DDF-275 Remove unused interface.

Note that this is notially public API, so removing it should (by SemVer) mean that the next ddf-content version would be a major change (3.0.0). In practice, I think it'll be OK.
Merge pull request #5 from bradh/ddf275

DDF-275 Remove unused interface.
Reviewed By: @mrmateo
DDF-425: Modified description in features file to use 'next line' instead of paragraph formatting.
DDF-426: Updated parent pom version in top level pom.
[maven-release-plugin] prepare release content-2.4.0
[maven-release-plugin] prepare for next development iteration
Merge pull request #4 from bradh/master

DDF-416 Correct logic to break out of loop on success
Reviewed by: @mrmateo
DDF-305 updated to ddf-parent-2.0.0