Merge pull request #1454 from DanWin/stable-1.1

Remove RackView widget before deleting the ChannelView (Rebase for stable-1.1 of #1448 )
better naming consistency with windows builds

i.e. `LMMS 1.1.0.dmg` will now be `lmms-1.1.0-mac10.7.dmg`
Fix compilation on Xcode 4.6
Fix ifdef typo leftover from clang fix