Dsub

This release includes several improvements:
- Fix `dstat` job/task ordering for `GoogleJobProvider` and `LocalJobProvider`
- Fix duplication of `dstat` output if duplicate parameters are passed in
- Added new GCE zones for `asia-south1` region

This release includes several improvements:

* Added support for GPU accelerators!
* Add start-time to `dstat` full output.
* Update getting-started documentation.

This release includes several improvements and bug fixes:

Bug fixes:
* `ddel` validates provider-specific arguments (see bug 87)

Internal improvements:
* Improved use of the `--age` flag allowing some tests to run faster.
* Refactored local provider to pull out `runner.sh`.

Version 0.1.1 contains new features and small bug fixes. We have also begun work on the Python API; this API is presumed unstable and not yet intended for broad use.

New features:
* `dsub` supports combining command-line (`--label`, `--env`, `--input`, `--output`) and `--tasks` file flags.
* Label values are less restrictive (for example, they can now be numeric).
* Added new GCE zones (`europe-west3`, `southamerica-east1`)
* `start-time` is now included in `dstat` full output
* `status-message` is now included in `dstat` full output.
* `--version` flag was added to `dsub`, `dstat`, and `ddel`.
* `local` provider now supports relative paths to local input/output files.

Minor changes:
* `run_tests.sh` now displays test timing information.
* `local` provider container names are more user-friendly.

Bugs fixed:
* `local` provider job/task names are now validated to conform with docker container name restrictions.
* `dstat` date field formats are now consistent.
* Various `local` provider internal fixes.

This is the first official dsub release. Future release will include a changelog.