Don't force rebuild via -a
Don't force rebuild via -a

In Go 1.5, this means rebuilding the std lib. Which is very slow, especially
if run twice.

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