Document Entity/PlayerPortalEvents and TravelAgent
Multiple fixes/changes
* Add more details on TravelAgent's description
* Don't repeat the same {@link} tag in the same comment block
* Use labels in every {@link} tag
Add details on what a portal creation involves
Multiple fixes
* Limit line-length to 78 chars
* Link to Getters instead of fields
* Don't use labels if not needed
* Don't capitalize @param and @return tags
Merge #40

Thanks @Ribesg

commit 6c8fd142c41370aadca0e1df1d1ef7bf80a42c6d
Author: Ribesg
Date:   2013-09-03 10:59:56 +0200

Multiple fixes

 * Limit line-length to 78 chars

 * Link to Getters instead of fields

 * Don't use labels if not needed

 * Don't capitalize @param and @return tags

commit 268f72838b7840ce297dfcec332e883323257b2d
Author: Ribesg
Date:   2013-09-03 10:46:46 +0200

Add details on what a portal creation involves

commit c4bc46560b95bc7e70a1154d2c26e7497674a44d
Author: Ribesg
Date:   2013-09-02 19:49:46 +0200

Multiple fixes/changes

 * Add more details on TravelAgent's description

 * Don't repeat the same {@link} tag in the same comment block

 * Use labels in every {@link} tag

commit 6ac5892474a519f20a785a93229d340c29d8cd3b
Author: Ribesg
Date:   2013-09-02 19:34:25 +0200

Document Entity/PlayerPortalEvents and TravelAgent
Clean up javadocs from #40