Move boom to versions, fix failure to launch

Boom2 is out, so to update the main cask, this is the previous (boom1) version. 
Oh - and I submitted an update in the main repo as well... :)  Combined with the upgrade to boom version 2.  So, I moved the old cask (version 1) to the versions repo, and poked in the postflight fix as well at the same time.  Then, I updated the boom.rb cask in the main repo to be version 2 (also with the postflight fix)