Refactor PapersController#show:

* Refactor finding Paper that has versioning suffix
* Using semantic version of deleted, ie deleted?
Refactor PapersController#show (cont.):

* Refactor the finding comments logic
Merge branch 'refactor-papers-controller' of git://github.com/joneslee85/scirate3 into joneslee85-refactor-papers-controller
Correct spacing on paper page