WIP: offline work

[raubitsj]

Going to cut rc5 with what is in here. will move remaining items out to next release. branch should be called: "fix/make-offline-not-horrible"

TODO:

• [x] add wandb off, wandb on cli commands
• [ ] add wandb status
• [ ] make sure we have offline info available in run methods
• [ ] audit what is saved to the binary log file
• [ ] make binary log file viewer
• [ ] add ability to sync tensorboard (maybe in this PR)
• [x] improve the output when online and waiting for process to finish
• [x] improve all the output with offline mode
• [ ] allow sync to specify just the directory
• [x] fix wandb.init() args and add "online" and "offline" to wandb_mode
• [ ] add noop mode (maybe)

Testing: https://app.wandb.ai/jeffr/regression/groups/20200826-0.0.41-fix_make-offline-great-b79e586-5ny7ny

[coveralls]

Pull Request Test Coverage Report for Build 3e256a1b-f2be-4e4d-b91c-d426764461a4

• 33 of 52 (63.46%) changed or added relevant lines in 8 files are covered.
• 956 unchanged lines in 49 files lost coverage.
• Overall coverage decreased (-4.2%) to 60.477%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
wandb/sync/sync.py	1	2	50.0%
wandb/sdk/wandb_settings.py	1	7	14.29%
wandb/cli/cli.py	5	17	29.41%
<!--	Total:	33	52	63.46%	-->

Files with Coverage Reduction	New Missed Lines	%
tests/utils/mock_server.py	1	84.98%
wandb/apis/internal_runqueue.py	1	25.0%
wandb/internal/internal.py	1	27.89%
wandb/internal/meta.py	1	72.39%
wandb/internal/run.py	1	61.54%
wandb/lib/ipython.py	1	71.43%
wandb/old/core.py	1	57.63%
wandb/sdk/wandb_config.py	1	69.72%
wandb/sweeps/base.py	1	80.0%
wandb/sweeps/params.py	1	36.82%
<!--	Total:	956		-->

Totals
Change from base Build 380a59ed-0677-4c6d-b8c1-e478b475782c:	-4.2%
Covered Lines:	12105
Relevant Lines:	20016

---

💛 - Coveralls

[vanpelt]

Adding noop mode would be HOT