You can also disable Heads-up notifications only for selected apps.
HeadsOff can also restore the ticker text in the statusbar to see a little notification preview.
• Disable all Lollipop Heads-up notifications
• Select single apps and disable or allow Lollipop Heads-up notifications (PRO)
• Disable Lollipop Heads-up notifications on the lockscreen
• Show ticker text (Pro)
• Show extended ticker text (Pro)
INFO & SUPPORT:
• G+ Community: https://plus.google.com/communities/100812207652817534041
• On XDA: http://forum.xda-developers.com/android/apps-games/app-headsoff-disable-lollipop-heads-t3117929