Allow command line access

For IEs not natively running python, provide a command line method of interacting with galaxy.
Enable R magic!
Merge pull request #15 from jmchilton/R

Install R into the base image.
Switch to a root-less docker container. Remove cron dependency.
add poor man's cron replacement
merge
restructure Dockerfile and some logic
spelling correction
Fixes for user/permission issues
Merge pull request #20 from bgruening/non-root-priv-fix

Fixes for user/permission issues
Reworked for argparse version
Merge pull request #17 from bgruening/non-root

Change the container to a non-root environment
Swapped for choices
Merge pull request #13 from bgruening/enable_cli

Allow command line access
Use objects interface to bioblend.

Its a higher-level, more correct interface. Especially for downloading - it actually correctly downloads against the API unlike the other end-points which target the web controllers and require the datasets to be public.