Update kubernetes version to 0.12.0
Update kubernetes version to 0.12.0

shilpamayanna/heapster,piosz/heapster,relh/heapster,titilambert/heapster,andyxning/heapster,vicki-c/heapster,AlmogBaku/heapster,mwringe/heapster,krzyzacy/heapster,skytap/heapster,apeeyush/heapster,lavalamp/heapster,naxhh/heapster,afein/heapster,lavalamp/heapster,a-robinson/heapster,dalanlan/heapster,mwringe/heapster,a-robinson/heapster,fzu-huang/heapster,burmanm/heapster,bruceauyeung/heapster,whuwxl/heapster,whuwxl/heapster,saad-ali/heapster,taimir/heapster,Stackdriver/heapster,johanneswuerbach/heapster,jimmidyson/heapster,andyxning/heapster,adfin/statster,afein/heapster,mwielgus/heapster,jszczepkowski/heapster,ravihansa3000/heapster,krzyzacy/heapster,vishh/heapster-1,huangyuqi/heapster,mdshuai/heapster,taimir/heapster,bluebreezecf/heapster,liubog2008/heapster,shilpamayanna/heapster,bluebreezecf/heapster,burmanm/heapster,luxas/heapster,naxhh/heapster,wulonghui/heapster,saad-ali/heapster,mwielgus/heapster,jfoy/heapster,liuhewei/heapster,thucatebay/heapster,AlmogBaku/heapster,Huawei-PaaS/heapster,ravihansa3000/heapster,dalanlan/heapster,adfin/statster,titilambert/heapster,nlamirault/heapster,vishh/heapster-1,saiwl/heapster,thucatebay/heapster,skytap/heapster,apeeyush/heapster,jackzampolin/heapster,piosz/heapster,jackzampolin/heapster,liubog2008/heapster,saiwl/heapster,relh/heapster,digideskio/heapster,fzu-huang/heapster,Huawei-PaaS/heapster,aegixx/heapster,nlamirault/heapster,jszczepkowski/heapster,Stackdriver/heapster,jimmidyson/heapster,mdshuai/heapster,luxas/heapster,liuhewei/heapster,johanneswuerbach/heapster,aegixx/heapster,digideskio/heapster,bruceauyeung/heapster,vicki-c/heapster,huangyuqi/heapster,wulonghui/heapster,jfoy/heapster