Add resume option to meta download script.

Closes #36

See merge request !35

Fixes #36.

Removed config files as being necessary.  Added chip-bin and idr bin argumens to workflow & chip-gen scripts.

Resolve "Zerone"

Closes #26 
Woo!

See merge request !34

Fixed a validation error with jobs with non-required arguments.  Trying to evaluate numeric types without a value.

Fixed arguments for pepr peak calling.  Updated params in peak_call module to correctly reflect the output files produced by hidden domains.

Resolve "MongoDB auth should be optional"

Closes #34

See merge request !33

Heavily updated the yaml file parsing for two primary reasons:
1. Make it more understandable what's actually going on underneath.
2. Allow for optional arguments.

Bridges compatability

Updates so things work on bridges as well as on local submit sites.

See merge request !32