v0.3.0: Feature and bug fix release after a long release silence.

Added
-----
- `run` - support for SLURM submitter
- `full-except-datalad` setuptools installation "extra_requires" scheme
- `AwsCondor` resource type to assist in establishing a simple HPC cluster with
  condor as ubmitted in AWS S3
- `put`, `get` of implemented resources got a recursive mode

Changed
-------
- `run`- switch to use use GNU parallel instead of the one from moreutils
  for local execution
- fixed up/improved documentation (in particular for `run`)
- use `docker>=3` instead of `docker-py`

Fixed
-----
- a wide variety of fixes

Removed
-------
- python 3.5 support