Upgraded Stormpath SDK to 1.0.RC2

Why this dependency is added here instead of adding it under dependencyManagement?

Also, I'm seeing that some dependencies are duplicated in the dependencies and dependenciesManagement blocks.

Finally, in order to make the life easier for the developer we should be adding the stormpath-http-client as as runtime dependency for the plugin, that way the developer doesn't have to add it in their pom files.