subreddit manager shortcuts .addedDate set to defaut if missing
default = beginning of epoch.
Safari (and probably other browsers) don't like JSON.stringify'ing invalid dates (new Date(undefined))
commentTools.macroSelection for adding macro text
"+add macro" button added to macros dropdown
just the regular one, not any category'd ones
refactor default macros into buildMacroDropdowns, use general-use function
automatically hide macro dropdown list when choosing macro (optional, default=hide)
Closes https://github.com/honestbleeps/Reddit-Enhancement-Suite/issues/507
Merge pull request #519 from mc10/master

Ignore imgur.com/removalrequest
move default macros back out of buildMacroDropdowns
move addMacroButton out of buildMacroDropdowns too
modules['userHighlight'].highlightFirstCommenter
add a cyan highlighto to distinguish the user who started a comment tree within that comment tree
ignore 'load more comments' when searching for first comments
remember when comment threads have already been processed
find the first comment when loading more comments
when finding first commentor author class, check all the *author* classes
whoops.
Merge pull request #521 from andytuba/highlight-comment-op

modules['userHighlight'].highlightFirstCommenter
Merge pull request #508 from andytuba/issue_507

Add "+ macro" button back to macro dropdown
fix spelling - commentor -> commenter
Merge pull request #511 from andytuba/issue_511

Subreddit shortcuts do not save changes if pre v4.1.5 format
Merge pull request #520 from mc10/master

Use strict (in)equality comparison operators, other various cleanup