Fix handler managers

- #start() and #stop() failed while iterating through badly initialized
  (or monkeypatched) Arrays.  When something (from the outside world)
  modifies the basic Array prototype, eg. adds a #remove method
  globally, then

    for (var key in arrayOfThings)

  will set key to "remove" in one of its iteration rounds.
Add iconv-lite to requirements
Fix project URLs and add new author

- Change github owner from gbence to cursorinsight
- Also add Olivér as an author
Merge https://github.com/cursorinsight/algernon-traP
Add unload handler
Add tab focus handler