./update allows both git 1.7 & git 1.8+

Fixes issues caused by https://github.com/cloudfoundry/cf-release/commit/0cecf43d5d2d4634806be6c4a8d0c4ac090e7029
Bump src/hm9000

Also, bumped hm9000's schema version in the config

Bump cloudfoundry/hm-workspace:
  Mark Rushakoff and Onsi Fakhouri:
     bumped duplicate stop message delay substantially ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13999046 )
     bump etcd to latest; improve metrics precision ( Travis Failed: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13996753 )
     clean up code with go fmt -s ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13994582 )
  Onsi Fakhouri:
     robustified store optimizations ( Travis Success: https://travis-ci.org/cloudfoundry/hm-workspace/builds/13993586 )