CBLT-120:  last_done_sgw_pkg now returns ( job_num, build_num, is_build_running, build_date, status )

Change-Id: I1003912a927dfe5d04f73531620344b4c87280ff
CBLT-120:  add macosx column

Change-Id: I11f761c773c626edefbd1143e7d6e187c4b76399
Merge branch 'master' of https://github.com/couchbase/build

* 'master' of https://github.com/couchbase/build:
  CBLT-80:  fix conditional that tests for GITSPEC = master or stable
  CBLT-80:  only build 'master' or 'stable'
  CBLT-80:  only build 'master' or 'stable'
  CBLT-82:  File is .tar.gz not .tgz
  CBLT-82:  translate Darwin into macosx
  CBLT-82:  want couchbase-sync-gateway_0.0-7_macosx-x86_64.tar.gz
  CBLT-82:  change PKG_NAME for macosx
  CBLT-82:  change PKG_NAME for macosx
  CBLT-82:  can pass in OS and ARCH instead of computing uname -s and uname -m
  CBLT-82:  can now pass in OS and ARCH instead of computing uname -s and uname -m

Change-Id: Ie5df5d3664dcf459e3401095a39d6e19b199857b