Add support for dropwizard 0.8.1

[silvpol]

When using dropwizard-swagger with dropwizard 0.8.1 I get following exception on startup:

Exception in thread "main" java.lang.AbstractMethodError
at io.dropwizard.views.ViewBundle.run(ViewBundle.java:112)
at io.dropwizard.views.ViewBundle.run(ViewBundle.java:92)
at io.dropwizard.setup.Bootstrap.run(Bootstrap.java:183)
at io.dropwizard.cli.EnvironmentCommand.run(EnvironmentCommand.java:41)
at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:76)
at io.dropwizard.cli.Cli.run(Cli.java:70)
at io.dropwizard.Application.run(Application.java:73)
at ibid.server.portal.PortalService.main(PortalService.java:50)

This seems to be a dependency issue - rebuilding dropwizard-swagger against 0.8.1 and disabling maven-enforcer-plugin (dropwizard-junit depends on 0.8.0 and fails build) allows to start without problem.

[jplock]

I submitted a PR to upgrade to Dropwizard 0.8.2 #63

[m-manu]

@federecio Can you please release 'Swagger for Dropwizard 0.8.2' to Maven Central? Thanks.

[m-manu]

@federecio Are you planning to continue to maintain this repo?