13: payu build command builds all models. Still relies on Experiment.
13: fix bin_path which is now in lab not expt.
13: make --laboratory argument carry across resubmits.
13: missing update from GET_env_vars to SET_env_vars.
Merge pull request #16 from nicholash/13-model-build

13 model build
whitespace
Fix default path to CICE executable when building.
Merge pull request #17 from nicholash/default-cice-build

Fix default path to CICE executable when building.