DATAREST-297 - Prepare 2.1.0.RELEASE.

Upgraded to Spring HATEOAS 0.11.0, Spring Plugin 1.1.0 and Evo Inflector 1.1.
DATAREST-276 - Yet another round of trailing slash handling.

We need to proactively strip trailing slashes during base URI handling as even on a successful match (which previously left trailing slashes intact) this might subsequently on the resolving of the repository metadata when evaluating the left-over lookup path against the @RequestMapping methods (which keeps trailing slashes).