Inconsistent behaviour in get_builds

[kako-nawao]

This is actually an inconsistency in the Build service in the Bamboo server, which Lists the latest builds for all plans on the Bamboo server when no plan is specified, and Provides information about builds executed for a build plan from latest to the first build when plan is specified.

But in the interest of making sense, I think it's convenient to move the first case to another method get_lastest_builds, and use get_builds only with a plan key.

[liocuevas]

thanks @kako-nawao ! I will work on this. Sorry for the delayed response :/