change default release to icehouse
change default release to icehouse

At the moment Havana is shown on the frontpage. This should be
changed to Icehouse.

Change-Id: If4c6e2c0db40fbf05743b0cf055ed093ffa9489e

dave-tucker/spectrometer,Solinea/stackalytics,mohitsethi/stackalytics,0xf2/stackalytics,AlexanderYAPPO/stackalytics,stackforge/stackalytics,nihilifer/stackalytics,dliu2015/stackalytics_zanata,mgkwill/spectrometer,Code-Fly/stackalytics,mhharsh/stackalytics,stackforge/stackalytics,zxiiro/spectrometer,dave-tucker/spectrometer,danielmellado/stackalytics,zxiiro/spectrometer,zxiiro/spectrometer,dave-tucker/spectrometer,stackforge/stackalytics,danielmellado/stackalytics,Code-Fly/stackalytics,zxiiro/spectrometer,mgkwill/spectrometer,openstack/stackalytics,joshuamckenty/stackalytics,mgkwill/spectrometer,dave-tucker/spectrometer,mgkwill/spectrometer,AlexanderYAPPO/stackalytics,nihilifer/stackalytics,danielmellado/stackalytics,0xf2/stackalytics,dliu2015/stackalytics_zanata,Code-Fly/stackalytics,nihilifer/stackalytics,joshuamckenty/stackalytics,Mirantis/stackalytics,0xf2/stackalytics,AlexanderYAPPO/stackalytics,0xf2/stackalytics,Mirantis/stackalytics,Mirantis/stackalytics,Solinea/stackalytics,kevinbenton/stackalytics,dliu2015/stackalytics_zanata,mohitsethi/stackalytics,openstack/stackalytics,kevinbenton/stackalytics,mhharsh/stackalytics,zxiiro/spectrometer,mgkwill/spectrometer,mohitsethi/stackalytics,mhharsh/stackalytics,openstack/stackalytics,Solinea/stackalytics,dave-tucker/spectrometer,openstack/stackalytics