World/chunk interface

Adding core world/chunk interface.

*Note* `World` will need a way to return all loaded chunks, but we'll need some discussion as to which containing object structure should be used.
Yeah, ID in all caps everywhere will be the convention.

> On Sep 8, 2014, at 4:27 PM, spaceemotion <notifications@github.com> wrote:
> 
> In src/main/java/org/spongepowered/api/world/World.java:
> 
> > + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> > + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> > + * THE SOFTWARE.
> > + */
> > +package org.spongepowered.api.world;
> > +
> > +import java.util.UUID;
> > +
> > +public interface World {
> > +
> > +    /**
> > +     * Gets the unique id for this world
> > +     *
> > +     * @return a unique id
> > +     */
> > +    public UUID getUniqueId();
> Just leaving this here: If we do the getID() in the plugin annotation as uppercase, this should be getUniqueID as well (as mentioned by @sk89q, this should be a global convention)
> 
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