even better "parent" button selector

fixes regression from dee61fc28ba6d3e6c82c41dbd5c719ade5c0ac8a. probably slightly more efficient, too.

assumes that "permalink" button will always be first button, which is a terrible assumption but it's still better than the previous version
showParent.show checks for parent comment existence before setting up hover div

Look before you leap, because I disapprove of try-catch in JavaScript; and it's slightly more efficient this way
Fix issue with not connecting to the immediate child of an expanded
set of comments. In particular loading top level comments was not
firing newCommentForms
even better "parent" button selector

fixes regression from dee61fc28ba6d3e6c82c41dbd5c719ade5c0ac8a. probably slightly more efficient, too.

assumes that "permalink" button will always be first button, which is a terrible assumption but it's still better than the previous version
showParent.show checks for parent comment existence before setting up hover div

Look before you leap, because I disapprove of try-catch in JavaScript; and it's slightly more efficient this way
Merge branch 'showparent-fix2' of github.com:andytuba/Reddit-Enhancement-Suite into showparent-fix2
Apply RES settings to comments newly added to page
Includes refactoring out the listenForChildren method so that it
can be reused in the siteTable handler
"Continue this thread" links no longer get uppers and downers
Merge pull request #286 from patricksnape/observers

Fix issue with loading top level comments
Merge pull request #283 from andytuba/showparent-fix2

Fix parent hover again